# Section 2 Astronomy 100 Fall 2003 Hour Exam 2 Test Form C

Size: px
Start display at page:

Download "Section 2 Astronomy 100 Fall 2003 Hour Exam 2 Test Form C"

Transcription

1 Section 2 Astronomy 100 Fall 2003 Hour Exam 2 Test Form C 1. DO NOT OPEN THIS EXAM UNTIL INSTRUCTED TO DO SO. 2. Use a dark pencil such as a number 2 pencil 3. On your bubble sheet, mark form C. 4. Answer ALL of the questions. There is no penalty for guessing. 5. Don't get stalled on any one question. 6. Choose the best answer each for the problems. 7. For your reference there are formulas below. DO NOT FORGET TO FILL IN TEST FORM C Possibly Useful Formulae and Constants: Area of a circle = πr 2 Area of a sphere = 4πr 2 Volume of a sphere = 4π/3 r 3 P 2 = a 3 d = vt d = 1/p F = ma F = GM 1 M 2 /R 2 R = 2 GM/c 2 I 1/r 2 Density = mass/volume Astronomical Unit: 1AU = 1.5 x 10 8 km Gravitational constant = x N m 2 kg -2 Mass of the Sun = x kg Speed of light in a vacuum = 3.0 x 10 8 m/s Sun s Radius = 6.96 x 10 8 m 1 Parsec = lyrs = x m NOTE: the above symbols may have different meanings in different equations! Page 1

2 1. A planetary nebula is A) a gas cloud surrounding a planet after its formation. B) a shell of ejected gases, glowing because of ultraviolet light from a dying central star. C) the spherical cloud of gas produced by a supernova explosion. D) the formation stages of planets around stars other than the Sun dwarf star. 2. The neutrino is A) an elusive, subatomic particle, having very small mass, very difficult to detect. B) another name for an antielectron or positron. C) another name for an antineutron, the antiparticle of the neutron, very difficult to detect. D) a heavy nuclear particle, easily detected. 3. What is the likely final fate of a star whose mass is 25 solar masses after it has finished its nuclear burning phases? A) It will condense to the point where it is composed completely of neutrons, the degeneracy of which will prevent further shrinkage. B) The degeneracy of the electrons within the star will prevent collapse below the diameter of a white dwarf. C) It will immediately split into two and become a binary star system. D) It will collapse and become a black hole. 4. In the process of helium shell fusion in low-mass stars near the end of their lives, the star moves upward and to the right as a red giant in the Hertzsprung-Russell diagram. In this process, the star is A) expanding, heating up, and becoming more luminous. B) expanding, cooling, and becoming more luminous. C) contracting, cooling, and hence becoming less luminous. D) contracting, becoming hotter, and becoming much less luminous. 5. Which of the following particles or types of radiation will provide the most direct information on the processes of nuclear fusion that are occurring at the present time in the solar core? A) Protons in the solar wind and from solar flares. B) Neutrinos. C) Visible light from the photosphere. D) X rays from the solar corona. 6. What is it that keeps a white dwarf star from collapsing inward upon itself? A) The physical size of the neutrons of which this star is composed. B) Normal gas pressure. C) Electron degeneracy or quantum crowding. D) Convection currents or updrafts from the nuclear furnace. Page 2

3 7. In the atomic nucleus there are often numerous positively charged protons. What keeps the nucleus from flying apart? A) The electromagnetic force. B) Neutrinos. C) The nuclear strong force. D) The force of gravity. 8. Which of the following is NOT a consequence of core collapse at the end of the life of a massive star? A) Great numbers of neutrinos are produced. B) The core density approaches the density of an atomic nucleus. C) Electrons combine with protons to form neutrons. D) The silicon core is converted to iron by fusion reactions. 9. BONUS: The atomic spectrum (the barcode) of an atom is the direct consequence of A) combination of a rarefied hot gas and gravity B) quantum leaps of electrons in the atom C) electrons orbiting the nucleus as described by Newton D) the temperature of the atom 10. In which of the following parameters does a photon of blue light NOT differ from a photon of yellow light, in a vacuum? A) Speed. B) Energy. C) Color. D) Wavelength. 11. The energy generation process inside a white dwarf star is A) the helium flash very efficient and rapid helium fusion. B) nonexistent a white dwarf star is simply cooling by radiating its original heat. C) the combining of protons and electrons to form neutrons within its core. D) hydrogen fusion. 12. The BIMA observatory, partially owned by UIUC, is A) a single 12 inch refracting telescope on the Quad. B) an optical telescope in Hawaii. C) an array of radio antennas in New Mexico. D) an array of microwave antennas in California. Page 3

4 13. The main reason Leslie will fly with his far-infrared instrument FIFI LS on SOFIA is A) to avoid the absorption of the far-infrared radiation by water vapor. B) to obtain photographs of resolution higher than can be obtained on the ground. C) to obtain longer observing times on specific sources by moving in the direction of the Earth's rotation. D) to avoid stray infrared radiation from the warm Earth and its occupants. 14. Two rocket ships are traveling past the Earth at 90% of the speed of light, in opposite directions (i.e., they are approaching each other). One turns on a searchlight, which is seen by scientists aboard the other. What speed do the scientists measure for this light (c = speed of light in a vacuum)? A) c. B) 0.9 c. C) 1.8 c (equal to 2 x 0.9 c). D) 1.9 c (equal to c). 15. In class, Leslie used liquid nitrogen and a balloon to demonstrate A) blackbody emission-- the cooled balloon emitted less blue light B) electron degeneracy-- the balloon was held up by the liquid air C) hydrostatic equilibrium-- the balloon collapsed when the pressure was reduced D) atomic spectrum emission-- the balloon did not emit a continuous band of light 16. Pulsars, emitting very regular radio and sometimes visible light pulses, are what type of object? A) Rapidly rotating neutron stars. B) Rapidly rotating binary star systems in which the stars undergo regular eclipses as seen from Earth. C) Pulsating variable stars. D) Black holes, with material falling regularly into them. 17. What determines whether a particular region of an interstellar cloud can collapse and form a star? A) The gas density, the ratio of the mass of the cloud over its volume, since this determines how gravity will act upon the cloud material. B) Only the amount of mass in the cloud, since this determines the strength of gravity. C) The amount of gravity pulling inward compared to gas pressure pushing outward. D) Only the temperature, since higher temperatures act to prevent collapse 18. The spectral class of the star Enif is K, while that of the Sun is G. Which of the following conclusions can be drawn about Enif from this information? A) It is intrinsically brighter than the Sun. B) It is cooler than the Sun. C) It is hotter than the Sun. D) It is intrinsically fainter than the Sun. Page 4

5 19. Microwaves travel through space at what speed? A) Slightly faster than the speed of light, because their wavelength is longer. B) Much slower than the speed of light. C) Much faster than the speed of light D) At the speed of light, 3 x 10 8 m/s. 20. To what do the words hydrostatic equilibrium in the Sun refer? A) The creation of one helium nucleus for the destruction of every four hydrogen nuclei. B) The balance of gas pressure inward and heat outward. C) The balance of gravity inward and gas pressure outward. D) The balance of gas pressure outward and magnetic forces inward. 21. The light from a small amount of a particular chemical element, when heated in a lamp (like in class), is found to consist of A) a pattern of narrow, bright emissions at specific wavelengths that are the same for all elements, only the relative intensities of each line differing for different elements. B) a pattern of narrow, bright emissions at wavelengths that are specific to the element and different for each element. C) a continuous spectrum of light whose peak wavelength is specific to the particular element. D) a continuous spectrum of light from which certain colors are missing or absorbed, the absorbed colors being different for different elements. 22. What is the source of most of the heavy elements on the Earth and in our own bodies? A) Explosive nucleosynthesis during supernova explosions of massive stars. B) Cosmic ray interactions with hydrogen and helium nuclei in interstellar clouds. C) Nuclear reactions during the formation of the universe (the Big Bang). D) Thermonuclear fusion reactions in the cores of massive stars. 23. Where on the Hertzsprung-Russell diagram do most local stars in our universe congregate? A) In the supergiant area, where the most massive stars spend a significant time. B) In the giants area, where most stars spend the longest time of their lives. C) On the main sequence, where stars are generating energy by fusion reactions. D) In the white dwarf area, the graveyard of stars. 24. Which of the following objects is NOT an endpoint of a star's evolutionary life? A) Black hole. B) Red giant. C) Neutron star. D) Supernova. Page 5

6 25. Our Sun will end its life by becoming A) a pulsar. B) a molecular cloud. C) a black hole. D) a white dwarf. 26. The stars that eventually become white dwarfs are those that start life with masses less than A) 3 solar masses. B) 25 solar masses. C) 8 solar masses. D) 1.4 solar masses. 27. The main reason for building large optical telescopes on the Earth's surface is A) to magnify images of objects and produce higher resolution photographs. B) to bring astronomical objects closer for more detailed examination by scientists. C) to collect more light from faint objects. D) for national prestige, with no scientific reason. 28. The center of the disk of the visible Sun appears brighter than the edges because we see A) a greater contribution from the corona of the Sun at the center of the disk. B) into deeper and cooler layers at the center of the solar disk. C) less radiation from the cooler chromosphere near the edges of the Sun. D) into deeper and hotter layers at the center of the disk. 29. Which is the correct sequence for the following end points of stellar evolution, in order of increasing mass? A) Black hole, neutron star, white dwarf. B) White dwarf, black hole, neutron star. C) White dwarf, neutron star, black hole. D) Neutron star, black hole, white dwarf. 30. A white dwarf star, the surviving core of a low-mass star toward the end of its life, can be found on the Hertzsprung-Russell diagram A) above and to the right of the main sequence, since it evolved there after its hydrogen fusion phase. B) below and to the left of the main sequence. C) at the upper left end of the main sequence, since its surface temperature is extremely high. D) at the bottom end of the main sequence, along which it has evolved throughout its life. Page 6

7 31. BONUS: Two stars are observed from another planet. Star A has a parallax of 1 arcseconds and star B has a parallax of 0.25 arcseconds. Star B has twice the intensity of Star A (i.e. I B = 2I A ). Star B is really times brighter than Star A intrinsically (i.e. if they were at the same distance). A) 32 B) 1/4 C) 1/2 D) 4 E) 1/ Which of the following statements is NOT a property of neutron stars? A) They contain strong gravitational fields but weak magnetic fields. B) They are composed almost entirely of neutrons. C) They emit relatively narrow beams of light and other radiation. D) They rotate from one to thirty times each second. 33. Stars that have ejected a planetary nebula go on to become A) protostars. B) white dwarfs. C) supernovae. D) red giants. 34. A high-mass star near the end of its life undergoes successive cycles of energy generation within its core in which gravitational collapse increases the temperature to the point where a new nuclear fusion cycle generates sufficient energy to stop the collapse. This process does not work beyond the silicon fusion cycle that produces iron. Why is this? A) Electrostatic forces between the highly charged iron nuclei are sufficient to overcome the collapse and stabilize the stellar core. B) Iron nuclei are so large that they occupy all remaining space and so the collapse cannot continue. C) The pressure from high-energy photons and neutrinos at the very high core temperatures reached at this stage of development is finally sufficient to halt the collapse. D) Fusion of iron nuclei into heavier nuclei requires energy rather than producing excess energy and therefore will not produce the additional gas pressure to halt the collapse. 35. The solar wind is A) a gentle outflow of solar material, mostly protons and electrons, that is always moving outward from the Sun. B) a violent, explosive expansion of specific regions of the Sun's atmosphere at certain times. C) the inflow of matter onto the Sun under gravitational attraction. D) ionized hydrogen gas and electrons orbiting the Sun between its surface and the planet Mercury. Page 7

8 36. The explosion of a supernova appears to leave behind A) a rapidly expanding shell of gas and a central neutron star. B) a rapidly rotating shell of gas, dust, and radiation, but no central object. C) a rapidly expanding shell of gas and a compact white dwarf star at its center. D) nothing; the explosion changes all the matter completely into energy, which then radiates into space at the speed of light. 37. When visible light passes through a glass prism or a glass lens, which wavelengths of light are deflected the least by the glass? A) The light is not deflected by glass because glass is transparent. B) The shorter wavelengths. C) All wavelengths have their directions changed by the same amount. D) The longer wavelengths. 38. What would happen to the gravitational force upon the Earth if the Sun were to be replaced by a 1-solar-mass black hole? A) It would remain as it is now. B) It would become extremely high, sufficient to pull the Earth into it. C) It would be much less, because the gravitational field of a black hole only exists very close to it. D) It would double in strength. 39. If you see an object moving past you at 90% of the speed of light, what will its length appear to be? A) It will look shorter than if it were at rest. B) It looks shorter than at rest while it is coming toward you and longer after it has passed you. C) Its length will appear to be unchanged from when it is at rest since it is a solid object. D) It will look longer than if it were at rest. 40. In terms of its total lifetime, the Sun is A) about 1/10 of the way through its life. B) about 1/4 of the way through its life. C) about half-way through its life. D) about 3/4 of the way through its life. 41. Granulation on the surface of the Sun is caused by A) magnetic field disturbances above the solar surface. B) convective currents carrying heat from beneath the surface. C) nuclear fusion processes occurring just below the surface. D) differential rotation of the Sun. Page 8

9 42. The major feature that distinguishes a sunspot from other regions on the Sun is A) faster rotation around the Sun's axis than neighboring regions. B) its greater light emission compared to the photosphere. C) a coronal hole existing above it. D) its very powerful magnetic field. Page 9

10 Answer Key 1. B 2. A 3. D 4. B 5. B 6. C 7. C 8. D 9. B 10. A 11. B 12. D 13. A 14. A 15. C 16. A 17. C 18. B 19. D 20. C 21. B 22. A 23. C 24. B 25. D 26. C 27. C 28. D 29. C 30. B 31. A 32. A 33. B 34. D 35. A 36. A 37. D 38. A 39. A 40. C 41. B 42. D Page 10

### Explain how the sun converts matter into energy in its core. Describe the three layers of the sun s atmosphere.

Chapter 29 and 30 Explain how the sun converts matter into energy in its core. Describe the three layers of the sun s atmosphere. Explain how sunspots are related to powerful magnetic fields on the sun.

### Astronomy 1504 Section 002 Astronomy 1514 Section 10 Midterm 2, Version 1 October 19, 2012

Astronomy 1504 Section 002 Astronomy 1514 Section 10 Midterm 2, Version 1 October 19, 2012 Choose the answer that best completes the question. Read each problem carefully and read through all the answers.

### Mar 22, INSTRUCTIONS: First ll in your name and social security number (both by printing

ASTRONOMY 0089: EXAM 2 Class Meets M,W,F, 1:00 PM Mar 22, 1996 INSTRUCTIONS: First ll in your name and social security number (both by printing and by darkening the correct circles). Sign your answer sheet

### Summer 2013 Astronomy - Test 3 Test form A. Name

Summer 2013 Astronomy - Test 3 Test form A Name Do not forget to write your name and fill in the bubbles with your student number, and fill in test form A on the answer sheet. Write your name above as

### ASTR Midterm 1 Phil Armitage, Bruce Ferguson

ASTR 1120-001 Midterm 1 Phil Armitage, Bruce Ferguson FIRST MID-TERM EXAM FEBRUARY 16 th 2006: Closed books and notes, 1 hour. Please PRINT your name and student ID on the places provided on the scan sheet.

### Exam # 3 Tue 12/06/2011 Astronomy 100/190Y Exploring the Universe Fall 11 Instructor: Daniela Calzetti

Exam # 3 Tue 12/06/2011 Astronomy 100/190Y Exploring the Universe Fall 11 Instructor: Daniela Calzetti INSTRUCTIONS: Please, use the `bubble sheet and a pencil # 2 to answer the exam questions, by marking

### ASTRONOMY 1 EXAM 3 a Name

ASTRONOMY 1 EXAM 3 a Name Identify Terms - Matching (20 @ 1 point each = 20 pts.) Multiple Choice (25 @ 2 points each = 50 pts.) Essays (choose 3 of 4 @ 10 points each = 30 pt 1.Luminosity D 8.White dwarf

### Notes for Wednesday, July 16; Sample questions start on page 2 7/16/2008

Notes for Wednesday, July 16; Sample questions start on page 2 7/16/2008 Wed, July 16 MW galaxy, then review. Start with ECP3Ch14 2 through 8 Then Ch23 # 8 & Ch 19 # 27 & 28 Allowed Harlow Shapely to locate

### Phys 100 Astronomy (Dr. Ilias Fernini) Review Questions for Chapter 9

Phys 0 Astronomy (Dr. Ilias Fernini) Review Questions for Chapter 9 MULTIPLE CHOICE 1. We know that giant stars are larger in diameter than the sun because * a. they are more luminous but have about the

### NSCI 314 LIFE IN THE COSMOS

NSCI 314 LIFE IN THE COSMOS 2 BASIC ASTRONOMY, AND STARS AND THEIR EVOLUTION Dr. Karen Kolehmainen Department of Physics CSUSB COURSE WEBPAGE: http://physics.csusb.edu/~karen MOTIONS IN THE SOLAR SYSTEM

### Properties of Stars. Characteristics of Stars

Properties of Stars Characteristics of Stars A constellation is an apparent group of stars originally named for mythical characters. The sky contains 88 constellations. Star Color and Temperature Color

### Stellar Astronomy Sample Questions for Exam 4

Stellar Astronomy Sample Questions for Exam 4 Chapter 15 1. Emission nebulas emit light because a) they absorb high energy radiation (mostly UV) from nearby bright hot stars and re-emit it in visible wavelengths.

### Chapter 33 The History of a Star. Introduction. Radio telescopes allow us to look into the center of the galaxy. The milky way

Chapter 33 The History of a Star Introduction Did you read chapter 33 before coming to class? A. Yes B. No You can see about 10,000 stars with the naked eye. The milky way Radio telescopes allow us to

### Astronomy 10 Test #2 Practice Version

Given (a.k.a. `First ) Name(s): Family (a.k.a. `Last ) name: ON YOUR PARSCORE: `Bubble your name, your student I.D. number, and your multiple-choice answers. I will keep the Parscore forms. ON THIS TEST

### Astronomy 104: Second Exam

Astronomy 104: Second Exam Stephen Lepp October 29, 2014 Each question is worth 2 points. Write your name on this exam and on the scantron. Short Answer A The Sun is powered by converting hydrogen to what?

### Beyond the Solar System 2006 Oct 17 Page 1 of 5

I. Stars have color, brightness, mass, temperature and size. II. Distances to stars are measured using stellar parallax a. The further away, the less offset b. Parallax angles are extremely small c. Measured

### CHAPTER 29: STARS BELL RINGER:

CHAPTER 29: STARS BELL RINGER: Where does the energy of the Sun come from? Compare the size of the Sun to the size of Earth. 1 CHAPTER 29.1: THE SUN What are the properties of the Sun? What are the layers

### Earth Space Systems. Semester 1 Exam. Astronomy Vocabulary

Earth Space Systems Semester 1 Exam Astronomy Vocabulary Astronomical Unit- Aurora- Big Bang- Black Hole- 1AU is the average distance between the Earth and the Sun (93 million miles). This unit of measurement

### LIFE CYCLE OF A STAR

LIFE CYCLE OF A STAR First stage = Protostar PROTOSTAR Cloud of gas and dust many light-years across Gravity tries to pull the materials together Eventually, at the center of the ball of dust and gas,

### Exam #2 Review Sheet. Part #1 Clicker Questions

Exam #2 Review Sheet Part #1 Clicker Questions 1) The energy of a photon emitted by thermonuclear processes in the core of the Sun takes thousands or even millions of years to emerge from the surface because

### L = 4 d 2 B p. 4. Which of the letters at right corresponds roughly to where one would find a red giant star on the Hertzsprung-Russell diagram?

Fall 2016 Astronomy - Test 3 Test form B Name Do not forget to write your name and fill in the bubbles with your student number, and fill in test form B on the answer sheet. Write your name above as well.

### L = 4 d 2 B p. 1. Which outer layer of the Sun has the highest temperature? A) Photosphere B) Corona C) Chromosphere D) Exosphere E) Thermosphere

Fall 2016 Astronomy - Test 3 Test form A Name Do not forget to write your name and fill in the bubbles with your student number, and fill in test form A on the answer sheet. Write your name above as well.

### Review: HR Diagram. Label A, B, C respectively

Stellar Evolution Review: HR Diagram Label A, B, C respectively A C B a) A: White dwarfs, B: Giants, C: Main sequence b) A: Main sequence, B: Giants, C: White dwarfs c) A: Main sequence, B: White Dwarfs,

### AST-1002 Section 0459 Review for Final Exam Please do not forget about doing the evaluation!

AST-1002 Section 0459 Review for Final Exam Please do not forget about doing the evaluation! Bring pencil #2 with eraser No use of calculator or any electronic device during the exam We provide the scantrons

### Beyond Our Solar System Chapter 24

Beyond Our Solar System Chapter 24 PROPERTIES OF STARS Distance Measuring a star's distance can be very difficult Stellar parallax Used for measuring distance to a star Apparent shift in a star's position

### CONTENT EXPECTATIONS

THE SUN & THE STARS CONTENT EXPECTATIONS STARS What are stars? Are they all the same? What makes them different? What is our nearest star? THE SUN Why is it important? provides heat and light that we need

### Antelope Valley College ASTR 101 Study Guide Exam 3

Antelope Valley College ASTR 101 Study Guide Exam 3 The third exam will cover material in Chapters 15-24. In addition to reading the chapters, reviewing notes, lecture slides, quizzes and homework assignments,

### Today The Sun. Events

Today The Sun Events Last class! Homework due now - will count best 5 of 6 Final exam Dec. 20 @ 12:00 noon here Review this Course! www.case.edu/utech/course-evaluations/ The Sun the main show in the solar

### AST 2010: Descriptive Astronomy EXAM 2 March 3, 2014

AST 2010: Descriptive Astronomy EXAM 2 March 3, 2014 DO NOT open the exam until instructed to. Please read through the instructions below and fill out your details on the Scantron form. Instructions 1.

### The Stars. Chapter 14

The Stars Chapter 14 Great Idea: The Sun and other stars use nuclear fusion reactions to convert mass into energy. Eventually, when a star s nuclear fuel is depleted, the star must burn out. Chapter Outline

### The Night Sky. The Universe. The Celestial Sphere. Stars. Chapter 14

The Night Sky The Universe Chapter 14 Homework: All the multiple choice questions in Applying the Concepts and Group A questions in Parallel Exercises. Celestial observation dates to ancient civilizations

### Astronomy 1144 Exam 3 Review

Stars and Stellar Classification Astronomy 1144 Exam 3 Review Prof. Pradhan 1. What is a star s energy source, or how do stars shine? Stars shine by fusing light elements into heavier ones. During fusion,

### 8/30/2010. Classifying Stars. Classifying Stars. Classifying Stars

Classifying Stars In the early 1900s, Ejnar Hertzsprung and Henry Russell made some important observations. They noticed that, in general, stars with higher temperatures also have brighter absolute magnitudes.

### Joy of Science Experience the evolution of the Universe, Earth and Life

Joy of Science Experience the evolution of the Universe, Earth and Life Review of last class Introduction to Astronomy Contents of today s lecture Quiz time Review Review 1 n Science is a way of producing

### Review Questions for the new topics that will be on the Final Exam

Review Questions for the new topics that will be on the Final Exam Be sure to review the lecture-tutorials and the material we covered on the first three exams. How does speed differ from velocity? Give

### 10/26/ Star Birth. Chapter 13: Star Stuff. How do stars form? Star-Forming Clouds. Mass of a Star-Forming Cloud. Gravity Versus Pressure

10/26/16 Lecture Outline 13.1 Star Birth Chapter 13: Star Stuff How do stars form? Our goals for learning: How do stars form? How massive are newborn stars? Star-Forming Clouds Stars form in dark clouds

### What is a star? A body of gases that gives off tremendous amounts of energy in the form of light & heat. What star is closest to the earth?

Stars What is a star? A body of gases that gives off tremendous amounts of energy in the form of light & heat. What star is closest to the earth? Answer: The SUN It s about 150,000,000 km from earth =

### Stars. The composition of the star It s temperature It s lifespan

Stars Stars A star is a ball of different elements in the form of gases The elements and gases give off electromagnetic radiation (from nuclear fusion) in the form of light Scientists study the light coming

### Stars & Galaxies. Chapter 27 Modern Earth Science

Stars & Galaxies Chapter 27 Modern Earth Science Chapter 27, Section 1 27.1 Characteristics of Stars How do astronomers determine the composition and surface temperature of a star? Composition & Temperature

### PHYS 160 Astronomy Take-home Test #4 Fall 2017

PHYS 160 Astronomy Take-home Test #4 Fall 2017 Instructions: This is a take-home test. The test period starts Monday 11/27/2017 at 2:10pm and ends at Wednesday 11/29/2017 at 1:10pm. The test must represent

### The Sun Our Star. Properties Interior Atmosphere Photosphere Chromosphere Corona Magnetism Sunspots Solar Cycles Active Sun

The Sun Our Star Properties Interior Atmosphere Photosphere Chromosphere Corona Magnetism Sunspots Solar Cycles Active Sun General Properties Not a large star, but larger than most Spectral type G2 It

### Physics HW Set 3 Spring 2015

1) If the Sun were replaced by a one solar mass black hole 1) A) life here would be unchanged. B) we would still orbit it in a period of one year. C) all terrestrial planets would fall in immediately.

### 18. Which graph best represents the relationship between the number of sunspots and the amount of magnetic activity in the Sun?

1. Which star has a surface temperature most similar to the surface temperature of Alpha Centauri? A) Polaris B) Betelgeuse C) Procyon B D) Sirius 2. Giant stars have greater luminosity than our sun mainly

### Stars and their properties: (Chapters 11 and 12)

Stars and their properties: (Chapters 11 and 12) To classify stars we determine the following properties for stars: 1. Distance : Needed to determine how much energy stars produce and radiate away by using

### The physics of stars. A star begins simply as a roughly spherical ball of (mostly) hydrogen gas, responding only to gravity and it s own pressure.

Lecture 4 Stars The physics of stars A star begins simply as a roughly spherical ball of (mostly) hydrogen gas, responding only to gravity and it s own pressure. X-ray ultraviolet infrared radio To understand

### Abundance of Elements. Relative abundance of elements in the Solar System

Abundance of Elements Relative abundance of elements in the Solar System What is the origin of elements in the universe? Three elements formed in the first minutes after the big bang (hydrogen, helium

### Astronomy 113. Dr. Joseph E. Pesce, Ph.D. Review. Semester Recap. Nature of Light. Wavelength. Red/Blue Light 4/30/18

https://www.theverge.com/2018/ 3/10/17104188/melodysheeptime-lapse-universe-earthformation-watch Astronomy 113 Dr. Joseph E. Pesce, Ph.D. Review Semester Recap ³Light and Radiation ³The Sun ³Measuring

### Chapters 12 and 13 Review: The Life Cycle and Death of Stars. How are stars born, and how do they die? 4/1/2009 Habbal Astro Lecture 27 1

Chapters 12 and 13 Review: The Life Cycle and Death of Stars How are stars born, and how do they die? 4/1/2009 Habbal Astro 110-01 Lecture 27 1 Stars are born in molecular clouds Clouds are very cold:

### The Universe. But first, let s talk about light! 2012 Pearson Education, Inc.

The Universe But first, let s talk about light! Light is fast! The study of light All forms of radiation travel at 300,000,000 meters (186,000 miles) per second Since objects in space are so far away,

### Stars & Galaxies. Chapter 27, Section 1. Composition & Temperature. Chapter 27 Modern Earth Science Characteristics of Stars

Stars & Galaxies Chapter 27 Modern Earth Science Chapter 27, Section 1 27.1 Characteristics of Stars Composition & Temperature Scientists use the following tools to study stars Telescope Observation Spectral

### Recall what you know about the Big Bang.

What is this? Recall what you know about the Big Bang. Most of the normal matter in the universe is made of what elements? Where do we find most of this normal matter? Interstellar medium (ISM) The universe

### UNIT 3: Astronomy Chapter 26: Stars and Galaxies (pages )

CORNELL NOTES Directions: You must create a minimum of 5 questions in this column per page (average). Use these to study your notes and prepare for tests and quizzes. Notes will be turned in to your teacher

### Answer Key for Exam C

Answer Key for Exam C 2 points each Choose the answer that best completes the question. Read each problem carefully and read through all the answers. Take your time. If a question is unclear, ask for clarification

### Answer Key for Exam B

Answer Key for Exam B 2 points each Choose the answer that best completes the question. Read each problem carefully and read through all the answers. Take your time. If a question is unclear, ask for clarification

### A Star is born: The Sun. SNC1D7-Space

A Star is born: The Sun SNC1D7-Space Exploring the Sun Our Sun, a star, is the most important celestial object for life on Earth. The solar nebula theory is the current theory used to explain the formation

### 2) On a Hertzsprung-Russell diagram, where would you find red giant stars? A) upper right B) lower right C) upper left D) lower left

Multiple choice test questions 2, Winter Semester 2015. Based on parts covered after mid term. Essentially on Ch. 12-2.3,13.1-3,14,16.1-2,17,18.1-2,4,19.5. You may use a calculator and the useful formulae

### Answer Key for Exam D

Answer Key for Exam D 2 points each Choose the answer that best completes the question. Read each problem carefully and read through all the answers. Take your time. If a question is unclear, ask for clarification

### LIFE CYCLE OF A STAR

LIFE CYCLE OF A STAR First stage = Protostar PROTOSTAR Cloud of gas and dust many light-years across Gravity tries to pull the materials together Eventually, at the center of the ball of dust and gas,

### Stellar Astronomy Sample Questions for Exam 3

Stellar Astronomy Sample Questions for Exam 3 Chapter 7 1. A protostar is formed by a) the rapid expansion of gas from an exploding star. b) the gravitational collapse of a rotating interstellar cloud.

### Earth Science, 13e Tarbuck & Lutgens

Earth Science, 13e Tarbuck & Lutgens Beyond Our Solar System Earth Science, 13e Chapter 24 Stanley C. Hatfield Southwestern Illinois College Properties of stars Distance Distances to the stars are very

### Name Date Period. 10. convection zone 11. radiation zone 12. core

240 points CHAPTER 29 STARS SECTION 29.1 The Sun (40 points this page) In your textbook, read about the properties of the Sun and the Sun s atmosphere. Use each of the terms below just once to complete

### To infinity, and beyond!

stars The night sky is filled with stars that shine at different levels of brightness. The brightness of the stars we observe can be related to the size of the star or its distance from Earth. In order

### Coriolis Effect - the apparent curved paths of projectiles, winds, and ocean currents

Regents Earth Science Unit 5: Astronomy Models of the Universe Earliest models of the universe were based on the idea that the Sun, Moon, and planets all orbit the Earth models needed to explain how the

### The Life Cycle of Stars. : Is the current theory of how our Solar System formed.

Life Cycle of a Star Video (5 min) http://www.youtube.com/watch?v=pm9cqdlqi0a The Life Cycle of Stars Solar Nebula Theory : Is the current theory of how our Solar System formed. This theory states that

### chapter 31 Stars and Galaxies

chapter 31 Stars and Galaxies Day 1:Technology and the Big Bang Studying the Stars A. Telescopes - Electromagnetic radiation emitted by stars and other objects include light, radio, and X-ray Space telescopes

### Prentice Hall EARTH SCIENCE

Prentice Hall EARTH SCIENCE Tarbuck Lutgens Chapter 25 Beyond Our Solar System 25.1 Properties of Stars Characteristics of Stars A constellation is an apparent group of stars originally named for mythical

### Astronomy Notes Chapter 13.notebook. April 11, 2014

All stars begin life in a similar way the only difference is in the rate at which they move through the various stages (depends on the star's mass). A star's fate also depends on its mass: 1) Low Mass

### Cosmology, Galaxies, and Stars OUR VISIBLE UNIVERSE

Cosmology, Galaxies, and Stars OUR VISIBLE UNIVERSE Cosmology Cosmology is the study of the universe; its nature, origin and evolution. General Relativity is the mathematical basis of cosmology from which

### Chapter 14. Stellar Evolution I. The exact sequence of evolutionary stages also depends on the mass of a star.

Chapter 14 Stellar Evolution I I. Introduction Stars evolve in the sense that they pass through different stages of a stellar life cycle that is measured in billions of years. The longer the amount of

### the nature of the universe, galaxies, and stars can be determined by observations over time by using telescopes

the nature of the universe, galaxies, and stars can be determined by observations over time by using telescopes The spectral lines of stars tell us their approximate composition Remember last year in Physics?

### 5) What spectral type of star that is still around formed longest ago? 5) A) F B) A C) M D) K E) O

HW2 Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The polarization of light passing though the dust grains shows that: 1) A) the dust grains

### Missing words: mass hydrogen burning electrostatic repulsion. gravitationally hydrogen temperature protostar

Instructions Fill in the blanks of each frame using the list of missing words given. Cut out each frame and arrange them on your page in order, then stick them down. The first two frames are already in

### Physics Homework Set 2 Sp 2015

1) A large gas cloud in the interstellar medium that contains several type O and B stars would appear to us as 1) A) a reflection nebula. B) a dark patch against a bright background. C) a dark nebula.

### 1. Star: A object made of gas found in outer space that radiates.

1. Star: A object made of gas found in outer space that radiates. 2. Stars produce extremely great quantities of energy through the process of. The chemical formula for nuclear fusion looks like this:

### Astronomy Ch. 21 Stellar Explosions. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

Name: Period: Date: Astronomy Ch. 21 Stellar Explosions MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A surface explosion on a white dwarf, caused

### AST 101 INTRODUCTION TO ASTRONOMY SPRING MIDTERM EXAM 2 TEST VERSION 1 ANSWERS

AST 101 INTRODUCTION TO ASTRONOMY SPRING 2008 - MIDTERM EXAM 2 TEST VERSION 1 ANSWERS Multiple Choice. In the blanks provided before each question write the letter for the phrase that best answers the

### Stars and Galaxies. Content Outline for Teaching

Section 1 Stars A. Patterns of stars - constellations 1. Ancient cultures used mythology or everyday items to name constellations 2. Modern astronomy studies 88 constellations 3. Some constellations are

### Ch. 29 The Stars Stellar Evolution

Ch. 29 The Stars 29.3 Stellar Evolution Basic Structure of Stars Mass effects The more massive a star is, the greater the gravity pressing inward, and the hotter and more dense the star must be inside

### Life and Death of a Star 2015

Life and Death of a Star 2015 Name Date 1. In the main-sequence, the core is slowly shrinking because A. the mass of the star is slowly increasing B. hydrogen fusing to helium makes the core more dense

### Birth & Death of Stars

Birth & Death of Stars Objectives How are stars formed How do they die How do we measure this The Interstellar Medium (ISM) Vast clouds of gas & dust lie between stars Diffuse hydrogen clouds: dozens of

### Stars, Galaxies, and the Universe

Stars, Galaxies, and the Universe Chapter Test A Multiple Choice Write the letter of the correct answer on the line at the left. 1. What is a giant ball of hot gases that undergo nuclear fusion? a. a planet

### Astronomy Stars, Galaxies and Cosmology Exam 3. Please PRINT full name

Astronomy 132 - Stars, Galaxies and Cosmology Exam 3 Please PRINT full name Also, please sign the honor code: I have neither given nor have I received help on this exam The following exam is intended to

### Galaxies and Stars. 3. Base your answer to the following question on The reaction below represents an energy-producing process.

Galaxies and Stars 1. To an observer on Earth, the Sun appears brighter than the star Rigel because the Sun is A) hotter than Rigel B) more luminous than Rigel C) closer than Rigel D) larger than Rigel

### They developed a graph, called the H-R diagram, that relates the temperature of a star to its absolute magnitude.

Ejnar Hertzsprung and Henry Russell noticed that stars with higher temperatures and large sizes also have brighter absolute magnitudes the actual amount of light given off by a star. (also referred to

### How Do Stars Appear from Earth?

How Do Stars Appear from Earth? Magnitude: the brightness a star appears to have from Earth Apparent Magnitude depends on 2 things: (actual intrinsic brightness) The color of a star is related to its temperature:

### The Sun. October 21, ) H-R diagram 2) Solar Structure 3) Nuclear Fusion 4) Solar Neutrinos 5) Solar Wind/Sunspots

The Sun October 21, 2002 1) H-R diagram 2) Solar Structure 3) Nuclear Fusion 4) Solar Neutrinos 5) Solar Wind/Sunspots Review Blackbody radiation Measuring stars distance luminosity brightness and distance

### The Sun. How are these quantities measured? Properties of the Sun. Chapter 14

The Sun Chapter 14 The Role of the Sun in the Solar System > 99.9% of the mass Its mass is responsible for the orderly orbits of the planets Its heat is responsible for warming the planets It is the source

### The Birth Of Stars. How do stars form from the interstellar medium Where does star formation take place How do we induce star formation

Goals: The Birth Of Stars How do stars form from the interstellar medium Where does star formation take place How do we induce star formation Interstellar Medium Gas and dust between stars is the interstellar

### Chapter 14: The Bizarre Stellar Graveyard. Copyright 2010 Pearson Education, Inc.

Chapter 14: The Bizarre Stellar Graveyard Assignments 2 nd Mid-term to be held Friday Nov. 3 same basic format as MT1 40 mult. choice= 80 pts. 4 short answer = 20 pts. Sample problems on web page Origin

### Types of Stars 1/31/14 O B A F G K M. 8-6 Luminosity. 8-7 Stellar Temperatures

Astronomy 113 Dr. Joseph E. Pesce, Ph.D. The Nature of Stars For nearby stars - measure distances with parallax 1 AU d p 8-2 Parallax A January ³ d = 1/p (arcsec) [pc] ³ 1pc when p=1arcsec; 1pc=206,265AU=3

### Test Natural Sciences 102 Section 8 noon --- VERSION A February 28, 2007

Correct responses indicated in boldface. 1. An astronomer is designing a new telescope to use in space. The Hubble Space Telescope operates at wavelengths close to 500nm ( 1nm = 10-9 meter). The new telescope

### The Life and Death of Stars

The Life and Death of Stars What is a Star? A star is a sphere of plasma gas that fuses atomic nuclei in its core and so emits light The name star can also be tagged onto a body that is somewhere on the

### Astronomy Exam 3 - Sun and Stars

Astronomy Exam 3 - Sun and Stars Study online at quizlet.com/_4zgp6 1. `what are the smallest group of stars in the H-R diagram 2. A star has a parallax of 0.05". what is the distance from the earth? white

### 1. What is the primary difference between the evolution of a low-mass star and that of a high-mass star?

FYI: The Lives of Stars E3:R6b 1. Read FYI: The Lives of Stars As you read use the spaces below to write down any information you find especially interesting. Also define the bold terms used in the text.

### High Mass Stars and then Stellar Graveyard 7/16/09. Astronomy 101

High Mass Stars and then Stellar Graveyard 7/16/09 Astronomy 101 Astronomy Picture of the Day Astronomy 101 Something Cool Betelgeuse Astronomy 101 Outline for Today Astronomy Picture of the Day Something

### ANSWER KEY. Stars, Galaxies, and the Universe. Telescopes Guided Reading and Study. Characteristics of Stars Guided Reading and Study

Stars, Galaxies, a the Universe Stars, Galaxies, and the Universe Telescopes Use Target Reading Skills Check student definitions for accuracy. 1. Electromagneticradiationisenergythatcan travel through

### How the Sun Works. Presented by the

How the Sun Works Presented by the The Sun warms our planet every day, provides the light by which we see and is absolutely necessary for life on Earth. In this presentation, we will examine the fascinating

### Stellar Evolution - Chapter 12 and 13. The Lives and Deaths of Stars White dwarfs, neutron stars and black holes

Stellar Evolution - Chapter 12 and 13 The Lives and Deaths of Stars White dwarfs, neutron stars and black holes During the early stages of a star formation the objects are called a protostars. The internal