Exam 4--PHYS 151--Spring 2017
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1 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 elements c. moving charges d. a constant magnetic field 2. Organize these types of radiation in order of shortest wavelength to longest wavelength: Gamma Radio Ultraviolet Visible 5. Which of these is NOT a property of an electromagnetic wave? a. frequency b. wavelength c. amplitude d. period e. All of these are properties of an EM wave. Light travels through plastic that has an index of refraction equal to 2.0. With what speed does the wave travel? (The speed of light in a vacuum is 3x10 8 m/s.) a. Radio, Visible, Ultraviolet, Gamma b. Gamma, Ultraviolet, Visible, Radio c. Ultraviolet, Visible, Radio, Gamma d. Gamma, Visible, Ultraviolet, Radio 3. Which of these colors of light carries the most energy? a. orange b. yellow c. green d. red 4. Which of these are two ways of thinking about how light travels through space? I. Rays II. Wave fronts III. Particles IV. Constant velocity a. III & IV b. I & IV c. II & III d. I & II a. 4x10 8 m/s b. 1.5x10 8 m/s c. 3x10 8 m/s d. x10 8 m/s 7. Which of the following is true? a. n 1 =n 2 b. n 1 <n 2 c. n 1 >n 2 d. Not enough information 8. Consider the previous figure. In which medium, does light travel fastest? a. medium 1 (n 1 ) b. medium 2 (n 2 ) c. the same speed in both 1
2 9. What is the index of refraction for a vacuum? a. -1 b. 2 c. 0 d. 1 e. a vacuum doesn t have a value for index of refraction 10. If you increase the frequency of a wave, what happens to the energy of that wave? a. The energy increases. b. The energy decreases. c. The energy stays the same. d. It depends on the speed of the wave. 11. What type of lens is this? a. convex & converging b. convex & diverging c. concave & converging d. concave & diverging 12. The focal length is equal to. I. ½ the center of curvature II. The point where parallel rays focus III. The center of curvature a. II & III b. I c. I &II d. II e. III 13. A virtual image... a. can only be created by mirrors. b. is imaginary. c. cannot be projected onto a screen d. can only be created by concave lenses e. cannot be seen 15. Consider this lens with a object on the left and an image on the right. If you move the object farther away, what will happen to the image? a. it will move closer to the lens b. it will move further from the lens c. it will disappear d. it will remain in the same position 1. Consider the previous figure. Is the image a real or virtual image? a. real b. virtual c. neither, it is inverted 17. Near-sighted people can t see objects that are. a. far away b. near 18. An astigmatism causes. a. Light to be dimmer than usual b. multiple focal points of light c. The light to focus behind the retina d. The light to focus in front of the retina e. The dispersion of light 19. For far-sighted people, the image created by the eye forms the retina. a. behind b. in front of c. on d. upside down on 14. A convex lens has a focal length of 2 meters. The center of curvature is 4 m. An object is 3 meters from the lens. What is the power of this lens? a. 2 diopters b. 0.5 diopters c. 24 diopters d. 2.7 diopters 2
3 20. Consider this diagram of the eye and answer the following questions. Which is the part that causes the greatest refraction of light? a. (1) b. (2) c. (3) d. (4) e. (5) 21. This part of the eye is called the lens a. 1 b. 2 c. 3 d To see an object as it moves further from the eye, the lens must become. a. thinner in the middle b. thicker in the middle c. completely flat d. completely spherical 23. Which of these best desribes the planetary model of the atom a. electrons are confined to discrete shells around the nucleus b. electrons orbit around the nucleus c. the atom has protons and electrons that are evenly distributed d. the energy of the nucleus is confined to particular shells 24. Which of these models for the atom is the most modern? a. planetary model b. plum pudding model c. shell model d. nuclear model 25. Atoms that have the same atomic number but different atomic masses are. a. different elements b. isotopes c. anions d. cations 2. Consider this isotope of carbon. How many neutrons does it have? 13 C a. 78 b. 8 c. 2 d. 19 e This type of radiation is usually harmful to people. a. electromagnetic b. ionizing c. visible d. microwave e. infrared 28. Nuclei with more protons than lead are unstable because... a. the nuclei have too many neutrons b. the strong nuclear force is too strong c. the nuclei are too big d. the weak nuclear force is too small 29. Which of these statements about the strong nuclear force (SNF) are true: I. The SNF acts over very small distances. II. The SNF is stronger than the electric force. III. The SNF is one of four fundamental forces of nature. a. I b. I & II c. II & III d. I & III e. all are true 3
4 30. An electron travels across one volt of potential difference. What energy does it gain? a. 3.14x10 12 J b ev c. 1 ev d. 3.4 Nm 31. It is relatively to remove an electron from an atom, and it is to remove a proton from an atom. a. easy; difficult b. easy; easy c. difficult; easy d. difficult; difficult 32. The atomic mass number of a nucleus is equivalent to which of the following numbers? a. difference in neutron and proton numbers b. sum of neutron and proton numbers c. number of protons present d. number of neutrons present 33. Which of these is the proper atomic notation for carbon-12? a. C b. C c. 12 C 12 d. 12 C 34. If there are 14 neutrons in 238 U, how many neutrons are found in the nucleus of 235 U? a. 141 b. 147 c. 145 d What type of nuclear decay is this process? 11 C 5 11 B+ 10 e+ν a. alpha b. beta-plus c. gamma d. beta-minus e. electron capture 3. What particle is emitted when 20 Na decays to 20 Ne? a. alpha b. beta (positron) c. beta (electron) d. gamma 37. Consider this beta-minus decay. What is the daughter nucleus? 234 Pa β+γ 91 a. Ac b. Th c. Pa d. U e. Np 38. What type of decay process is represented here? a. electron capture b. beta-plus c. alpha decay d. beta-minus 39. What is the daughter nucleus of this decay process: a. Nb b. Mo c. Tc d. Ru e. Rh 40. In alpha-decay, the nucleus a. ejects a helium nucleus b. captures a neutron c. captures an electron d. ejects a positron 41. Which of these is my favorite class? a. Ancient Greek b. Colonel Core c. Philosophy 101 d. Physics for Allied Health!!!! 4
5 ID: A Exam 4--PHYS 151--Spring 2017 Answer Section MULTIPLE CHOICE 1. ANS: C PTS: 1 REF: S17 2. ANS: B PTS: 1 REF: S17 3. ANS: C PTS: 1 REF: S17 4. ANS: D PTS: 1 REF: S17 5. ANS: E PTS: 1 REF: S17. ANS: B PTS: 1 REF: S17 7. ANS: C PTS: 1 REF: S17 8. ANS: B PTS: 1 REF: S17 9. ANS: D PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: C PTS: 1 REF: S ANS: C PTS: 1 REF: S ANS: B PTS: 1 REF: S ANS: A PTS: 1 REF: S17 1. ANS: A PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: B PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: C PTS: 1 REF: S ANS: D PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: B PTS: 1 REF: S ANS: C PTS: 1 REF: S ANS: B PTS: 1 REF: S17 2. ANS: E PTS: 1 REF: S ANS: B PTS: 1 REF: S ANS: C PTS: 1 REF: S ANS: E PTS: 1 REF: S ANS: C PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: B PTS: 1 DIF: 1 TOP: 29.1 Some Properties of Nuclei 33. ANS: D PTS: 1 REF: S ANS: D PTS: 1 DIF: 1 REF: S ANS: B PTS: 1 3. ANS: B PTS: 1 REF: S17 TOP: 29.4 The Decay Processes 37. ANS: D PTS: 1 REF: S ANS: A PTS: 1 REF: S ANS: C PTS: 1 REF: S17 1
6 ID: A 40. ANS: A PTS: 1 REF: S ANS: D PTS: 1 2
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