Electromagnetic Waves

Size: px
Start display at page:

Download "Electromagnetic Waves"

Transcription

1 4/15/12 Chapter 26: Properties of Light Field Induction Ok, so a changing magnetic field causes a current (Faraday s law) Why do we have currents in the first place? electric fields of the charges Changing current produces a magnetic field, too! (Maxwell s counterpart to Faraday s Law) Electromagnetism is a 2-way street Electromagnetic Waves An EM wave is the result of the mutual induction of electric and magnetic fields If the wave has wavelengths between ~ nanometers, it will be a visible EM wave: Light! The speed of light is the wave speed for EM waves. Moving charges (currents) create magnetic fields, and changing magnetic fields create electric fields These effects create electromagnetic waves Recall: Properties of Waves Wavelength and Frequency Wavelength is the distance between two wave peaks Frequency is the number of times per second that a wave vibrates up and down wave speed = wavelength x frequency wavelength x frequency = speed of light = constant 1

2 Speed of Light c = 3.0 x 10 8 meters/sec in a vacuum Example: What is the wavelength of radio waves being broadcast at a frequency of 100 megahertz? The Electromagnetic Spectrum Gamma Rays X-rays Ultraviolet Light Visible Light (ROY G BIV) Infrared Light Microwaves & Radio Waves Light vs. Sound Important distinction: sound waves need a medium in order to travel. Light waves need no medium, they can travel even in a vacuum. How do light and matter interact? Reflection and Scattering Emission Absorption Transmission Transparent objects let light through Opaque objects block or absorb light Reflection or Scattering Mirror reflects light in a particular direction Movie screen scatters light in all directions 2

3 Light Waves in Matter Light travels at 3.0 x 10 8 m/s in a vacuum Light waves in matter travel more slowly, depending on the material and the frequency of the wave Slowing of light Dispersion High f = more dispersion Low f = less dispersion Transparent vs. Opaque Materials When light hits the atoms in a material, the electrons absorb it and are forced to vibrate The vibrating electron either emits a photon or transfers the energy as heat Time-delay between absorption and reemission is why the speed of light is lower in the material. Transparent Materials Average speed of light through different materials Vacuum: c (300,000,000 m/s) Atmosphere: slightly less than c (but rounded off to c) Water: 0.75 c Glass: 0.67 c, depending on material Diamond: 0.41 c Opaque Materials Most things around us are opaque; they absorb light without re-emitting it. Vibrations given by light to their atoms and molecules are turned into random kinetic energy (into internal energy). These materials become slightly warmer Materials can be opaque to some kinds of light and transparent to other kinds of light What about shiny metal objects? Recall that metal materials often have lots of free electrons These electrons can reflect the light, rather than transmitting it or absorbing it (more on reflection later) 3

4 A beam of light passes through a transparent sheet of plastic. Which of the following is true? A. The speed of the light slows down while in the plastic B. The frequency of the light is decreased while in the plastic C. Both A and B are true. Shadows Many everyday objects are opaque, so they block light. Shadows are the areas where light does not reach! Eclipses: Extreme Shadows In a solar eclipse, the Moon is precisely in between the Earth & the Sun, and casts a shadow on the surface of the Earth. In a lunar eclipse, the Earth is precisely in between the Sun & the Moon, and casts a shadow on the Moon Eclipses are relatively rare occurrences: most of the time, the Moon, Earth, & Sun are not lined up. Cornea How does your eye form an image? Refraction Focusing Light Refraction is the bending of light Eye uses refraction to focus light Refraction can cause parallel light rays to converge to a focus 4

5 4/15/12 Image Formation Rods & Cones Two different kinds of antennae that pick up light in our retinas Rods: handle vision in low light Cones: handle color vision and detail Three types of cones, sensitive to different frequency ranges. The focal plane is where light from different directions comes into focus The image behind a single (convex) lens is actually upside-down! Seeing and Perception Since only rods fire under low light, we mostly see in b&w when it s dark Edges of the retina are very sensitive to motion Our retinas have lateral inhibition so we can see details even under high contrast Our eyes highlight edges and differences (this is the source of many optical illusions) Main Points Light is EM waves The EM spectrum Transparent and Opaque materials Sight and Perception 5

Chapter 26: Properties of Light

Chapter 26: Properties of Light Lecture Outline Chapter 26: Properties of Light This lecture will help you understand: Electromagnetic Waves The Electromagnetic Spectrum Transparent Materials Opaque Materials Seeing Light The Eye Electromagnetic

More information

Wave - Particle Duality of Light

Wave - Particle Duality of Light Properties of Light Objectives Explain wave-particle duality State the speed of light Describe electromagnetic waves and the electromagnetic spectrum Explain how light interacts with transparent and opaque

More information

Chapter 26. Properties of Light

Chapter 26. Properties of Light Chapter 26 Properties of Light James Clerk Maxwell discovered that light is composed of a. electromagnetic waves. b. ultrasonic waves. c. infrasonic waves. d. electron vibrations. James Clerk Maxwell discovered

More information

Light is an electromagnetic wave (EM)

Light is an electromagnetic wave (EM) What is light? Light is a form of energy. Light travels in a straight line Light speed is 3.0 x 10 8 m/s Light is carried by photons Light can travel through a vacuum Light is a transverse wave Light is

More information

Note on Posted Slides. History of Light. History of Light

Note on Posted Slides. History of Light. History of Light Note on Posted Slides These are the slides that I intended to show in class on Wed. Mar. 27, 2013. They contain important ideas and questions from your reading. Due to time constraints, I was probably

More information

Physics Worksheet Sound and Light Section: Name:

Physics Worksheet Sound and Light Section: Name: Do Now: What is common between sound and light? What are the differences between sound and light? Sound Waves 1. Define Sound Waves from three different perspectives 6. Speed of sound =. Formula: v =.

More information

Being a Chemist. Summary Sheets. Gleniffer High School

Being a Chemist. Summary Sheets. Gleniffer High School Being a Chemist Summary Sheets Gleniffer High School 0 State that the light year is a measure of astronomical distance State the speed at which light travels Give examples of the relative distance between

More information

SECTION 3 & 4 LIGHT WAVES & INFORMATION TRANSFER

SECTION 3 & 4 LIGHT WAVES & INFORMATION TRANSFER SECTION 3 & 4 LIGHT WAVES & INFORMATION TRANSFER Light Waves Light is a type of energy that travels as waves. Light is different than other waves because it does not need matter to travel. Light waves

More information

The Nature of Light. We have a dual model

The Nature of Light. We have a dual model Light and Atoms Properties of Light We can come to understand the composition of distant bodies by analyzing the light they emit This analysis can tell us about the composition as well as the temperature

More information

Electromagnetic spectra

Electromagnetic spectra Properties of Light Waves, particles and EM spectrum Interaction with matter Absorption Reflection, refraction and scattering Polarization and diffraction Reading foci: pp 175-185, 191-199 not responsible

More information

Revision checklist SP4 5. SP4 Waves. SP4a Describing waves. SP4b Wave speeds. SP4c Refraction

Revision checklist SP4 5. SP4 Waves. SP4a Describing waves. SP4b Wave speeds. SP4c Refraction SP4 Waves SP4a Describing waves Recall that waves transfer energy and information but do not transfer matter. Describe waves using the terms frequency, wavelength, amplitude, period and velocity. Describe

More information

Core Concept. PowerPoint Lectures to accompany Physical Science, 8e. Chapter 7 Light. New Symbols for this Chapter 3/29/2011

Core Concept. PowerPoint Lectures to accompany Physical Science, 8e. Chapter 7 Light. New Symbols for this Chapter 3/29/2011 PowerPoint Lectures to accompany Physical Science, 8e Chapter 7 Light Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Core Concept Light is electromagnetic radiation

More information

Sound and Light. Light

Sound and Light. Light Sound and Light Light What do you think? Read the two statements below and decide whether you agree or disagree with them. Place an A in the Before column if you agree with the statement or a D if you

More information

Revision checklist. Step Learning outcome Had a look Nearly there Nailed it! Step Learning outcome Had a look Nearly there Nailed it!

Revision checklist. Step Learning outcome Had a look Nearly there Nailed it! Step Learning outcome Had a look Nearly there Nailed it! SP4 Waves SP4a Describing waves Step Learning outcome Had a look Nearly there Nailed it Recall that waves transfer energy and information but do not transfer matter. Describe waves using the terms frequency,

More information

Electromagnetic Radiation

Electromagnetic Radiation Electromagnetic Radiation aka Light Properties of Light are simultaneously wave-like AND particle-like Sometimes it behaves like ripples on a pond (waves). Sometimes it behaves like billiard balls (particles).

More information

Being a Physicist Unit 5. Summary Sheets. Gleniffer High School

Being a Physicist Unit 5. Summary Sheets. Gleniffer High School Being a Physicist Unit 5 Summary Sheets Gleniffer High School 0 Experiences & Outcomes I can explain how sound vibrations are carried by waves through air, water and other materials SCN 2-11a By exploring

More information

aka Light Properties of Light are simultaneously

aka Light Properties of Light are simultaneously Today Interaction of Light with Matter Thermal Radiation Kirchhoff s Laws aka Light Properties of Light are simultaneously wave-like AND particle-like Sometimes it behaves like ripples on a pond (waves).

More information

P5 Revision Questions

P5 Revision Questions P5 Revision Questions Part 2 Question 1 How can microwaves be used to communicate? Answer 1 Sent from transmitter, received and amplified by satellite in space, re-transmitted back to earth and picked

More information

School. Team Number. Optics

School. Team Number. Optics School Team Number Optics Physical Optics (30%) Proceed to the laser shoot (40%) when your team number is called. 1. What are the four colors used in the CMYK color model? (2 points) 2. Muscae Volitantes

More information

Newton s Laws of Motion

Newton s Laws of Motion Newton s Laws of Motion #1: A body continues at rest or in uniform motion in a straight line unless acted upon by a force. Why doesn t the soccer ball move on its own? What causes a soccer ball to roll

More information

Introduction to Electromagnetic Radiation and Radiative Transfer

Introduction to Electromagnetic Radiation and Radiative Transfer Introduction to Electromagnetic Radiation and Radiative Transfer Temperature Dice Results Visible light, infrared (IR), ultraviolet (UV), X-rays, γ-rays, microwaves, and radio are all forms of electromagnetic

More information

Chapter 27: Light. What is light?

Chapter 27: Light. What is light? Chapter 27: Light What is light? Scientists first theorized light was a wave as it behaved with a wave properties, i.e. diffraction and interference. In 1905, Einstein realized that light was behaving

More information

Waves Junior Science. Easy to read Version

Waves Junior Science. Easy to read Version Waves Junior Science Easy to read Version 1a Waves transfer energy Waves are a means of transferring energy from one place to another without also transferring matter. Some waves need a medium (matter)

More information

LIGHT. A beam is made up of several rays. It maybe parallel, diverging (spreading out) or converging (getting narrower). Parallel Diverging Converging

LIGHT. A beam is made up of several rays. It maybe parallel, diverging (spreading out) or converging (getting narrower). Parallel Diverging Converging LIGHT Light is a form of energy. It stimulates the retina of the eye and produces the sensation of sight. We see an object when light leaves it and enters the eye. Objects such as flames, the sum and stars

More information

Chapter 5 Light and Matter: Reading Messages from the Cosmos

Chapter 5 Light and Matter: Reading Messages from the Cosmos Chapter 5 Light and Matter: Reading Messages from the Cosmos 5.1 Light in Everyday Life Our goals for learning How do we experience light? How do light and matter interact? How do we experience light?

More information

PHYSICS. Ray Optics. Mr Rishi Gopie

PHYSICS. Ray Optics. Mr Rishi Gopie Ray Optics Mr Rishi Gopie Ray Optics Nature of light Light is a form of energy which affects the human eye in such a way as to cause the sensation of sight. Visible light is a range of electromagnetic

More information

Unit 3: Optics Chapter 4. Properties of Light

Unit 3: Optics Chapter 4. Properties of Light Unit 3: Optics Chapter 4 Properties of Light There are many types of light sources... Fluorescence Incandescence Electric Bioluminescence Chemiluminescence Combustion The Nature of Light Pythagoras A Greek

More information

qq k d Chapter 16 Electric and Magnetic Forces Electric charge Electric charges Negative (electron) Positive (proton)

qq k d Chapter 16 Electric and Magnetic Forces Electric charge Electric charges Negative (electron) Positive (proton) Chapter 16 Electric and Magnetic Forces Electric charge Electric charges Negative (electron) Positive (proton) Electrons and protons in atoms/molecules Ions: atoms/molecules with excess of charge Ions

More information

Name Date Class _. Please turn to the section titled The Nature of Light.

Name Date Class _. Please turn to the section titled The Nature of Light. Please turn to the section titled The Nature of Light. In this section, you will learn that light has both wave and particle characteristics. You will also see that visible light is just part of a wide

More information

Properties of Electromagnetic Radiation Chapter 5. What is light? What is a wave? Radiation carries information

Properties of Electromagnetic Radiation Chapter 5. What is light? What is a wave? Radiation carries information Concepts: Properties of Electromagnetic Radiation Chapter 5 Electromagnetic waves Types of spectra Temperature Blackbody radiation Dual nature of radiation Atomic structure Interaction of light and matter

More information

Tides Light the Electromagnetic Spectrum Thermal Radiation. Events. Homework Due Next time (Sept. 22) Exam I on Sept. 24

Tides Light the Electromagnetic Spectrum Thermal Radiation. Events. Homework Due Next time (Sept. 22) Exam I on Sept. 24 Events Today Tides Light the Electromagnetic Spectrum Thermal Radiation Homework Due Next time (Sept. 22) Exam I on Sept. 24 Why are stars and planets spherical? Gravity pulls - it is an attractive force

More information

Sound Waves. Sound waves are caused by vibrations and carry energy through a medium

Sound Waves. Sound waves are caused by vibrations and carry energy through a medium Chapter 16 Sound Waves Sound waves are caused by vibrations and carry energy through a medium An example of a compressional wave Waves can spread out in all directions Their speed depends on its medium

More information

CHAPTERS: 9.1, 10.1 AND 10.2 LIGHT WAVES PROPERTIES

CHAPTERS: 9.1, 10.1 AND 10.2 LIGHT WAVES PROPERTIES Name Period CHAPTERS: 9.1, 10.1 AND 10.2 LIGHT WAVES PROPERTIES ACTIVITY LESSON DESCRIPTION SCORE/POINTS 1. NT WAVES FOLDABLE (blue, green & yellow completely filled in.) /30 /30 2. WS READING GUIDE FOR

More information

ASTRONOMY 161. Introduction to Solar System Astronomy. Class 9

ASTRONOMY 161. Introduction to Solar System Astronomy. Class 9 ASTRONOMY 161 Introduction to Solar System Astronomy Class 9 Light Monday, January 29 Look, but don t touch. - Astronomers Motto Light: Key Concepts (1) Visible light is just one form of electromagnetic

More information

Light.notebook May 03, 2016

Light.notebook May 03, 2016 Unit 4 Light LIGHT.1 Describe the ray model of light. 16.1 LIGHT.2 Predict the effect of distance on light s illuminance. 16.1 LIGHT.3 Explain polarization and the Doppler effect. 16.2 LIGHT.4 Describe

More information

Chapter 5 Light and Matter: Reading Messages from the Cosmos. 5.1 Light in Everyday Life. How do we experience light?

Chapter 5 Light and Matter: Reading Messages from the Cosmos. 5.1 Light in Everyday Life. How do we experience light? Chapter 5 Light and Matter: Reading Messages from the Cosmos 5.1 Light in Everyday Life Our goals for learning: How do we experience light? How do light and matter interact? How do we experience light?

More information

SPECTRUM. Dispersion. This phenomenon can be observed in a lab environment using a

SPECTRUM. Dispersion. This phenomenon can be observed in a lab environment using a SPECTRUM Dispersion The phenomenon due to which a polychromatic light, like sunlight, splits into its component colours, when passed through a transparent medium like a glass prism, is called dispersion

More information

Recall: The Importance of Light

Recall: The Importance of Light Key Concepts: Lecture 19: Light Light: wave-like behavior Light: particle-like behavior Light: Interaction with matter - Kirchoff s Laws The Wave Nature of Electro-Magnetic Radiation Visible light is just

More information

The Nature of Light I: Electromagnetic Waves Spectra Kirchoff s Laws Temperature Blackbody radiation

The Nature of Light I: Electromagnetic Waves Spectra Kirchoff s Laws Temperature Blackbody radiation The Nature of Light I: Electromagnetic Waves Spectra Kirchoff s Laws Temperature Blackbody radiation Electromagnetic Radiation (How we get most of our information about the cosmos) Examples of electromagnetic

More information

Review: Properties of a wave

Review: Properties of a wave Radiation travels as waves. Waves carry information and energy. Review: Properties of a wave wavelength (λ) crest amplitude (A) trough velocity (v) λ is a distance, so its units are m, cm, or mm, etc.

More information

Fluorescence. Incandescence. Electric. Bioluminescence Chemiluminescence. Combustion

Fluorescence. Incandescence. Electric. Bioluminescence Chemiluminescence. Combustion Fluorescence Incandescence Electric Bioluminescence Chemiluminescence Combustion Pythagoras A Greek philosopher Believed light was beams of tiny particles The eyes could detect these particles and see

More information

Physics 201. Professor P. Q. Hung. 311B, Physics Building. Physics 201 p. 1/3

Physics 201. Professor P. Q. Hung. 311B, Physics Building. Physics 201 p. 1/3 Physics 201 p. 1/3 Physics 201 Professor P. Q. Hung 311B, Physics Building Physics 201 p. 2/3 What are electromagnetic waves? Electromagnetic waves consist of electric fields and magnetic fields which

More information

Sunlight. Sunlight 2. Sunlight 4. Sunlight 3. Sunlight 5. Sunlight 6

Sunlight. Sunlight 2. Sunlight 4. Sunlight 3. Sunlight 5. Sunlight 6 Sunlight 1 Sunlight 2 Introductory Question Sunlight When you look up at the sky during the day, is the light from distant stars reaching your eyes? A. Yes B. No Sunlight 3 Observations about Sunlight

More information

Chapter 5: Light and Matter: Reading Messages from the Cosmos

Chapter 5: Light and Matter: Reading Messages from the Cosmos Chapter 5 Lecture Chapter 5: Light and Matter: Reading Messages from the Cosmos Light and Matter: Reading Messages from the Cosmos 5.1 Light in Everyday Life Our goals for learning: How do we experience

More information

Chapter 5 Light: The Cosmic Messenger. Copyright 2012 Pearson Education, Inc.

Chapter 5 Light: The Cosmic Messenger. Copyright 2012 Pearson Education, Inc. Chapter 5 Light: The Cosmic Messenger 5.1 Basic Properties of Light and Matter Our goals for learning: What is light? What is matter? How do light and matter interact? What is light? Light is an electromagnetic

More information

Grade 5. Practice Test. What is Light? How Light Behaves. Photo Credits (in order of appearance): Alexandr Mitiuc/Dreamstime.com

Grade 5. Practice Test. What is Light? How Light Behaves. Photo Credits (in order of appearance): Alexandr Mitiuc/Dreamstime.com Name Date Grade 5 What is Light? How Light Behaves Photo Credits (in order of appearance): Alexandr Mitiuc/Dreamstime.com Today you will read two passages. Read these sources carefully to gather information

More information

Bernoulli s Principle. Application: Lift. Bernoulli s Principle. Main Points 3/13/15. Demo: Blowing on a sheet of paper

Bernoulli s Principle. Application: Lift. Bernoulli s Principle. Main Points 3/13/15. Demo: Blowing on a sheet of paper Bernoulli s Principle Demo: Blowing on a sheet of paper Where the speed of a fluid increases, internal pressure in the fluid decreases. Due to continuous flow of a fluid: what goes in must come out! Fluid

More information

the ability to do work or cause change (work is force exerted on an object causing it to move a distance)

the ability to do work or cause change (work is force exerted on an object causing it to move a distance) Vocabulary Terms - Energy energy the ability to do work or cause change (work is force exerted on an object causing it to move a distance) heat Heat is a form of energy that flows between two substances

More information

SNC2D PHYSICS 4/27/2013. LIGHT & GEOMETRIC OPTICS L What Is Light? (P ) What Is Light? What Is Light?

SNC2D PHYSICS 4/27/2013. LIGHT & GEOMETRIC OPTICS L What Is Light? (P ) What Is Light? What Is Light? SNC2D PHYSICS LIGHT & GEOMETRIC OPTICS L What Is Light? (P.380-391) What Is Light? For centuries, scientists have tried to understand the nature of light and its properties. Some of these properties are

More information

Waves. Electromagnetic. No medium required. Can travel in a vacuum (empty space).

Waves. Electromagnetic. No medium required. Can travel in a vacuum (empty space). Electromagnetic Waves Made up of vibrating electric and magnetic fields. Carry energy. Move in the form of both a wave and a particle. No medium required. Can travel in a vacuum (empty space). Demonstrate

More information

Newton s Law of Gravity. Isaac Newton ( ) Newton s Law of Gravity. Newton s Laws of Motion. Newton s Laws of Motion 2/17/17

Newton s Law of Gravity. Isaac Newton ( ) Newton s Law of Gravity. Newton s Laws of Motion. Newton s Laws of Motion 2/17/17 Isaac Newton (1642-1727) English physicist and mathematician Studied motion, light, and gravity Newton puts all the pieces together Key idea: Mass Mass is the amount of matter in an object NOT the same

More information

Discussion Review Test #2. Units 12-19: (1) (2) (3) (4) (5) (6)

Discussion Review Test #2. Units 12-19: (1) (2) (3) (4) (5) (6) Discussion Review Test #2 Units 12-19: (1) (2) (3) (4) (5) (6) (7) (8) (9) Galileo used his observations of the changing phases of Venus to demonstrate that a. the sun moves around the Earth b. the universe

More information

f= = s = Hz m Thus (B) is the correct answer.

f= = s = Hz m Thus (B) is the correct answer. MCAT Physics Problem Solving Drill 17: Electromagnetic Radiation Question No. 1 of 10 Question 1. Violet light has a wavelength of 700 nm. What is the frequency of this radiation? Question #01 (A) 2.3

More information

Grade 8 Science Unit 2: Optics Chapters 4, 5 and 6

Grade 8 Science Unit 2: Optics Chapters 4, 5 and 6 Grade 8 Science Unit 2: Optics Chapters 4, 5 and 6 At the end of this unit, students will be expected to 1. Provide examples of ideas and theories of light used in the past to explain observed properties.

More information

Light and Matter: Reading Messages from the Cosmos. White light is made up of many different colors. Interactions of Light with Matter

Light and Matter: Reading Messages from the Cosmos. White light is made up of many different colors. Interactions of Light with Matter Chapter 5 Lecture The Cosmic Perspective Light and Matter: Reading Messages from the Cosmos 5.1 Light in Everyday Life Our goals for learning: How do we experience light? How do light and matter interact?

More information

How does your eye form an Refraction

How does your eye form an Refraction Astronomical Instruments Eyes and Cameras: Everyday Light Sensors How does your eye form an image? How do we record images? How does your eye form an image? Refraction Refraction is the bending of light

More information

L 31 Light and Optics [1] Galileo s result. Galileo and the speed of light. The speed of light inside matter. Measurement of the speed of light

L 31 Light and Optics [1] Galileo s result. Galileo and the speed of light. The speed of light inside matter. Measurement of the speed of light L 31 Light and Optics [1] Measurements of the speed of light: 186,000 miles per second (1 foot per nanosecond) light propagating through matter transparent vs. opaque materials colors, why is an orange

More information

Light. Mike Maloney Physics, SHS

Light. Mike Maloney Physics, SHS Light Mike Maloney Physics, SHS 1 Light What is LIGHT? WHERE DOES IT COME FROM? 2003 Mike Maloney 2 What is Light? Light is a wave, or rather acts like a wave. How do we know since we cannot see it? We

More information

Name Class Date. a. Light is a wave. 2. Empedocles. b. Light consists of tiny 3. Euclid

Name Class Date. a. Light is a wave. 2. Empedocles. b. Light consists of tiny 3. Euclid Exercises 27.1 Early Concepts of (page 533) Scientist Idea About 1. Einstein a. is a wave. 2. Empedocles b. consists of tiny 3. Euclid particles. 4. Huygens c. Vision results from streamers or filaments

More information

Name Class Date. What two models do scientists use to describe light? What is the electromagnetic spectrum? How can electromagnetic waves be used?

Name Class Date. What two models do scientists use to describe light? What is the electromagnetic spectrum? How can electromagnetic waves be used? CHAPTER 16 12 SECTION Sound and Light The Nature of Light KEY IDEAS As you read this section, keep these questions in mind: What two models do scientists use to describe light? What is the electromagnetic

More information

Telescopes: Portals of Discovery

Telescopes: Portals of Discovery Telescopes: Portals of Discovery How do light and matter interact? Emission Absorption Transmission Transparent objects transmit light Opaque objects block (absorb) light Reflection or Scattering Reflection

More information

IDS 102: Electromagnetic Radiation and the Nature of Light

IDS 102: Electromagnetic Radiation and the Nature of Light IDS 102: Electromagnetic Radiation and the Nature of Light Major concepts we will cover in this module are: electromagnetic spectrum; wave intensity vs. wavelength, and the difference between light reflection,

More information

The Light of Your Life. We can see the universe because atoms emit photons

The Light of Your Life. We can see the universe because atoms emit photons The Light of Your Life We can see the universe because atoms emit photons Astronomy is an observational science Our messengers are Light (electromagnetic waves) Gravitational waves Cosmic rays (particles)

More information

National 3 Waves and Radiation

National 3 Waves and Radiation What is a wave? National 3 Waves and Radiation 1. Wave Properties The basic definition Waves are a way of transporting energy from one place to another. They do this through some form of vibration. We

More information

Grade 8 Science: Unit 3-Optics Chapter 4: Properties of Light

Grade 8 Science: Unit 3-Optics Chapter 4: Properties of Light Grade 8 Science: Unit 3-Optics Chapter 4: Properties of Light Key Terms: Microscope, telescope, amplitude, crest, energy, force, frequency, hertz, medium, transverse wave, trough, wave, wavelength, reflection,

More information

Nature of Light. What is light? Sources of light. an electromagnetic radiation capable of stimulating the retina of the eye.

Nature of Light. What is light? Sources of light. an electromagnetic radiation capable of stimulating the retina of the eye. Nature of Light What is light? an electromagnetic radiation capable of stimulating the retina of the eye. electrons Nucleus Electron gains energy When it moves to a higher level Photon bundle (quantum)

More information

Electromagnetic Radiation. Physical Principles of Remote Sensing

Electromagnetic Radiation. Physical Principles of Remote Sensing Electromagnetic Radiation Physical Principles of Remote Sensing Outline for 4/3/2003 Properties of electromagnetic radiation The electromagnetic spectrum Spectral emissivity Radiant temperature vs. kinematic

More information

Conceptual Physics. Luis A. Anchordoqui. Department of Physics and Astronomy Lehman College, City University of New York. Lesson VI October 3, 2017

Conceptual Physics. Luis A. Anchordoqui. Department of Physics and Astronomy Lehman College, City University of New York. Lesson VI October 3, 2017 Conceptual Physics Luis A. Anchordoqui Department of Physics and Astronomy Lehman College, City University of New York Lesson VI October 3, 2017 https://arxiv.org/abs/1711.07445 L. A. Anchordoqui (CUNY)

More information

0.4 s 0.8 s 1.5 s. 2.5 s. 2. A beam of light from a ray box spreads out as shown in the diagram and strikes a plane mirror.

0.4 s 0.8 s 1.5 s. 2.5 s. 2. A beam of light from a ray box spreads out as shown in the diagram and strikes a plane mirror. 1. ship is fitted with echo-sounding equipment. pulse of sound is sent downwards from the ship at a speed of 1500 m/s. The seabed is 600m below the ship. How long will it take the pulse of sound to return

More information

Quest Chapter 29. turned back think bounce. Reread the definition of the law of reflection on page 444.

Quest Chapter 29. turned back think bounce. Reread the definition of the law of reflection on page 444. 1 A wave is turned back when it meets the boundary of the medium in which it is traveling. The wave is said to have undergone 1. interference. 2. diffraction. 3. reflection. 4. refraction. 2 What is the

More information

LECTURE 11 ELECTROMAGNETIC WAVES & POLARIZATION. Instructor: Kazumi Tolich

LECTURE 11 ELECTROMAGNETIC WAVES & POLARIZATION. Instructor: Kazumi Tolich LECTURE 11 ELECTROMAGNETIC WAVES & POLARIZATION Instructor: Kazumi Tolich Lecture 11 2 25.5 Electromagnetic waves Induced fields Properties of electromagnetic waves Polarization Energy of electromagnetic

More information

Photochemical principles

Photochemical principles Chapter 1 Photochemical principles Dr. Suzan A. Khayyat 1 Photochemistry Photochemistry is concerned with the absorption, excitation and emission of photons by atoms, atomic ions, molecules, molecular

More information

Exam 4--PHYS 151--Spring 2017

Exam 4--PHYS 151--Spring 2017 Name: Exam 4--PHYS 151--Spring 2017 Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Electromagnetic radiation is caused by a. electricity b. radioactive

More information

EA Notes (Scen 101), Tillery Chapter 7. Light

EA Notes (Scen 101), Tillery Chapter 7. Light EA Notes (Scen 101), Tillery Chapter 7 Light Introduction Light is hard to study because you can't see it, you only see it's effects. Newton tried to explain the energy in a light beam as the KE of a particle

More information

Which type of electromagnetic wave has a wavelength longer than that of yellow light? A. Infrared radiation C. X-rays B. Gamma Rays D.

Which type of electromagnetic wave has a wavelength longer than that of yellow light? A. Infrared radiation C. X-rays B. Gamma Rays D. Which type of electromagnetic wave has a wavelength longer than that of yellow light? A. Infrared radiation C. X-rays B. Gamma Rays D. UV Rays Science Starter! 10.14-15.13! THE UNIVERSE AND ELECTROMAGNETIC

More information

The Electromagnetic Spectrum

The Electromagnetic Spectrum The Electromagnetic Spectrum 1 of 19 Boardworks Ltd 2016 The Electromagnetic Spectrum 2 of 19 Boardworks Ltd 2016 Detecting waves beyond the visible spectrum 3 of 19 Boardworks Ltd 2016 Invisible light

More information

THE ELECTROMAGNETIC SPECTRUM. (We will go into more detail later but we need to establish some basic understanding here)

THE ELECTROMAGNETIC SPECTRUM. (We will go into more detail later but we need to establish some basic understanding here) What is color? THE ELECTROMAGNETIC SPECTRUM. (We will go into more detail later but we need to establish some basic understanding here) Light isn t just white: colors is direct evidence that light has

More information

Year 9- Physics First Term Revision

Year 9- Physics First Term Revision Year 9- Physics First Term Revision All objects EMIT and ABSORB infrared radiation The hotter the obect, the more infrared radiation it emits (gives off) Dark/Matte surfaces are good absorbers of infrared

More information

Astronomy. Optics and Telescopes

Astronomy. Optics and Telescopes Astronomy A. Dayle Hancock adhancock@wm.edu Small 239 Office hours: MTWR 10-11am Optics and Telescopes - Refraction, lenses and refracting telescopes - Mirrors and reflecting telescopes - Diffraction limit,

More information

Name Date Class. Electromagnetic Spectrum. Colors

Name Date Class. Electromagnetic Spectrum. Colors b e n c h m a r k t e s t : p h y s i c a l s c i e n c e Multiple Choice Directions: Use the diagram below to answer question 1. Electromagnetic Spectrum Radio waves A B C D Gamma rays Long Wavelength

More information

3/9/2011. Outline Chapter 7 Waves Water Waves Water Waves. Water waves are really circular. They are an example of Mechanical waves.

3/9/2011. Outline Chapter 7 Waves Water Waves Water Waves. Water waves are really circular. They are an example of Mechanical waves. Outline Chapter 7 Waves 7-1. Water Waves 7-2. Transverse and Longitudinal Waves 7-3. Describing Waves 7-4. Standing Waves 7-5. Sound 7-6. Doppler Effect 7-7. Musical Sounds 7-8. Electromagnetic Waves 7-9.

More information

Chapter 17, Electromagnetic Waves Physical Science, McDougal-Littell, 2008

Chapter 17, Electromagnetic Waves Physical Science, McDougal-Littell, 2008 SECTION 1 (PP. 553-558): ELECTROMAGNETIC WAVES HAVE UNIQUE TRAITS. Georgia Standards: S8P4a Identify the characteristics of electromagnetic and mechanical waves; S8P4d Describe how the behavior of waves

More information

VISIBLE LIGHT. L 32 Light and Optics [2] Seeing through the window. Windows behaving as mirrors. Seeing through a window

VISIBLE LIGHT. L 32 Light and Optics [2] Seeing through the window. Windows behaving as mirrors. Seeing through a window L 32 Light and Optics [2] Measurements of the speed of light The bending of light refraction Total internal reflection Dispersion Dispersion Rainbows Atmospheric scattering Blue sky and red sunsets Mirrors

More information

Light and Matter: Reading Messages from the Cosmos Pearson Education, Inc.

Light and Matter: Reading Messages from the Cosmos Pearson Education, Inc. Light and Matter: Reading Messages from the Cosmos Light and Color Light is a form of energy (think of the warmth of sunlight or a lightbulb) White light is actually made up of many different colors. How

More information

3. The very long ones are called waves, and the very short ones are called waves.

3. The very long ones are called waves, and the very short ones are called waves. NASA Mission: Science Introduction to the Electromagnetic Spectrum Web Quest Directions: Load the following website which will discuss the electromagnetic spectrum in detail. http://missionscience.nasa.gov/ems/01_intro.html

More information

LECTURE 11 ELECTROMAGNETIC WAVES & POLARIZATION. Instructor: Kazumi Tolich

LECTURE 11 ELECTROMAGNETIC WAVES & POLARIZATION. Instructor: Kazumi Tolich LECTURE 11 ELECTROMAGNETIC WAVES & POLARIZATION Instructor: Kazumi Tolich Lecture 11 2 25.5 Electromagnetic waves Induced fields Properties of electromagnetic waves Polarization Energy of electromagnetic

More information

Unit 4 Parent Guide: Waves. What is a wave?

Unit 4 Parent Guide: Waves. What is a wave? Unit 4 Parent Guide: Waves What is a wave? A wave is a disturbance or vibration that carries energy from one location to another. Some waves require a medium to transmit the energy whereas others can travel

More information

Announcements. One more bit of vocabulary about waves

Announcements. One more bit of vocabulary about waves Announcements Homework 5 now available; due on Sunday, Nov. 16 before midnight No class on Tuesday, Nov. 11 (Veteran s Day) Midterm 2 on Wednesday, Nov. 12 Study materials now available on class web page;

More information

E-JUST s Sample Entrance Exam Faculty of Engineering

E-JUST s Sample Entrance Exam Faculty of Engineering E-JUST s Sample Entrance Exam Faculty of Engineering PHYSICS Time: 1 hr Choose the right answer: 1. Three equal resistors connected in series across a source e.m.f. together dissipate 10 watt. If the same

More information

Refraction is the bending of light when it passes from one substance into another. Your eye uses refraction to focus light.

Refraction is the bending of light when it passes from one substance into another. Your eye uses refraction to focus light. Telescopes Portals of Discovery Chapter 6 Lecture The Cosmic Perspective 6.1 Eyes and Cameras: Everyday Light Sensors How do eyes and cameras work? Seventh Edition Telescopes Portals of Discovery The Eye

More information

Ch Guided Reading Sound and Light

Ch Guided Reading Sound and Light Name Date Hour Chapter 15 Answer Key Ch.15-18 Guided Reading Sound and Light 1. Compare the speed of sound as it travels within a liquid, a solid, and a gas. Why does the speed of sound differ? Sound travels

More information

Chapter 6 Telescopes: Portals of Discovery. Agenda. How does your eye form an image? Refraction. Example: Refraction at Sunset

Chapter 6 Telescopes: Portals of Discovery. Agenda. How does your eye form an image? Refraction. Example: Refraction at Sunset Chapter 6 Telescopes: Portals of Discovery Agenda Announce: Read S2 for Thursday Ch. 6 Telescopes 6.1 Eyes and Cameras: Everyday Light Sensors How does your eye form an image? Our goals for learning How

More information

Electromagnetic Radiation

Electromagnetic Radiation Electromagnetic Radiation Producing EMR All EMR is produced by accelerating charges Consists of changing electric and magnetic fields Speed of all EMR in vacuum is 3.00 x 10 8 m/s EMR is made up electric

More information

PHYS 160 Astronomy Test #2 Fall 2017 Version A

PHYS 160 Astronomy Test #2 Fall 2017 Version A PHYS 160 Astronomy Test #2 Fall 2017 Version A I. True/False (1 point each) Circle the T if the statement is true, or F if the statement is false on your answer sheet. 1. A blackbody emits all of its radiation

More information

Electromagnetic Waves

Electromagnetic Waves ELECTROMAGNETIC RADIATION AND THE ELECTROMAGNETIC SPECTRUM Electromagnetic Radiation (EMR) THE ELECTROMAGNETIC SPECTRUM Electromagnetic Waves A wave is characterized by: Wavelength (λ - lambda) is the

More information

Chapter 33: ELECTROMAGNETIC WAVES 559

Chapter 33: ELECTROMAGNETIC WAVES 559 Chapter 33: ELECTROMAGNETIC WAVES 1 Select the correct statement: A ultraviolet light has a longer wavelength than infrared B blue light has a higher frequency than x rays C radio waves have higher frequency

More information

Heat Transfer. Conduction, Convection, and Radiation. Review: Temperature

Heat Transfer. Conduction, Convection, and Radiation. Review: Temperature Heat Transfer Conduction, Convection, and Radiation Review: Temperature! Temperature is:! The quantity that tells how hot or cold something is compared with a standard! A measure of the average kinetic

More information

LIGHT. Question. Until very recently, the study of ALL astronomical objects, outside of the Solar System, has been with telescopes observing light.

LIGHT. Question. Until very recently, the study of ALL astronomical objects, outside of the Solar System, has been with telescopes observing light. LIGHT Question Until very recently, the study of ALL astronomical objects, outside of the Solar System, has been with telescopes observing light. What kind of information can we get from light? 1 Light

More information

Chapter Ray Optics and Optical Instrument

Chapter Ray Optics and Optical Instrument Chapter Ray Optics and Optical Instrument Q1. Focal length of a convex lens of refractive index 1.5 is 2 cm. Focal length of the lens when immersed in a liquid of refractive index of 1.25 will be [1988]

More information

9/19/ Basic Properties of Light and Matter. Chapter 5: Light: The Cosmic Messenger. What is light? Lecture Outline

9/19/ Basic Properties of Light and Matter. Chapter 5: Light: The Cosmic Messenger. What is light? Lecture Outline Lecture Outline 5.1 Basic Properties of Light and Matter Chapter 5: Light: The Cosmic Messenger Our goals for learning: What is light? What is matter? How do light and matter interact? What is light? Light

More information