Physics 11 Exam 3 Spring 2016
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1 Physics 11 Exam 3 Spring 2016 Name: Circle the BEST Answer 1 Electromagnetic waves consist of A) compressions and rarefactions of electromagnetic pulses. B) oscillating electric and magnetic fields. C) particles of light energy. D) high-frequency gravitational waves. 2. In a longitudinal wave the compressions and rarefactions travel in A) the same direction. B) opposite directions. C) a vacuum. 3. If the frequency of a certain wave is 10 hertz, its period is A) 0.1 second. B) 10 seconds. C) 100 seconds. D) 1 second 4. Frequencies that are too high for humans to hear are called: a) supersonic b) infrasonic c) hypersonic d) ultrasonic e) subsonic f) funkasonic 5. Speeds faster than the speed of sound are: a) supersonic b) infrasonic c) hypersonic d) ultrasonic e) subsonic f) funkasonic 6. A standing wave occurs when A) two waves overlap. B) a wave reflects upon itself. C) the speed of the wave is zero or near zero. D) the amplitude of a wave exceeds its wavelength. 7. A floating leaf oscillates up and down two complete cycles in one second as a water wave passes by. The wave's wavelength is 10 meters. What is the wave's speed? A) 2 m/s B) 10 m/s C) 20 m/s D) 40 m/s 8. For light, a red shift indicates that the light source is moving A) toward you. B) away from you. C) at right angles to you. D) actually, all of these 9. If at a concert you run toward the orchestra, the frequency of the sound you hear will be A) decreased. B) increased. C) neither decreased nor increased. 10. If at a concert, a wind blows directly from the orchestra toward you, the speed of the sound you hear will be A) decreased. B) increased. C) neither decreased nor increased. 11. The approximate range of human hearing is A) 10 hertz to 10,000 hertz. B) 20 hertz to 20,000 hertz. C) 40 hertz to 40,000 hertz. 12. Sound travels faster in A) air. B) water. C) steel. D) a vacuum. 13. The object with the highest natural frequency is a A) small bell. B) large bell. C) medium size bell. 14. On some days, air nearest the ground is colder than air that is higher up. On one of these days, sound waves A) tend to be refracted upward. B) tend to be refracted downward. 15. The loudness of a musical sound is a measure of the sound wave's A) wavelength. B) frequency. C) speed. D) amplitude. 16. The source of all electromagnetic waves is A) changes in atomic energy levels. B) vibrating atoms. C) accelerating electric charges. D) crystalline fluctuations.
2 17. Compared to ultraviolet waves, the wavelength of infrared waves is A) shorter. B) longer. C) the same. 18. Compared to its average speed in air, the average speed of light in glass is A) more. B) less. C) the same. 19. The sensation of color is seen when light falls on the eye's A) rods. B) cones 20. The color of an opaque object is the same as the light that is A) transmitted. B) absorbed. C) reflected. 21. The complementary color of blue is A) red. B) green. C) yellow. D) cyan. E) magenta. 22. The greenish blue of water is evidence for the A) reflection of greenish-blue light. B) reflection of red light. C) absorption of greenish-blue light. D) absorption of red light. 23. A blue object will appear black when illuminated with A) blue light. B ) cyan light. C) yellow light. D) magenta light. 24. The worst thing you can do for the health of a green-leafed plant is to illuminate it with only A) red light. B) green light. C) blue light. D) All are equally naughty. 25. Colors seen when gasoline forms a thin film on water are a demonstration of A) refraction. B) reflection. C) dispersion. D) polarization. E) interference. 26. A laboratory experiment produces a double-slit interference pattern on a screen. If the screen is moved closer to the slits, the fringes will be A. Closer together. B. In the same positions. C. Farther apart. 27. In the image and setup shown in #26, if the laser light is changed to blue light, the fringes will be: A. Closer together. B. In the same positions. C. Farther apart. 28. Indicate in the diagram the colors of the shadows by putting a letter in the area a. red b. green c. blue d. magenta e. cyan f. yellow 29. When a light ray passes at an angle from air to water, the ray inside the water bends A. toward the normal. B. away from the normal. C. parallel to the normal. 30. A mirage occurs for road surfaces that are A. warm. B. cold. C. wet. D. hard. 31. A beam of light travels faster in A. glass. B. water. C. plastic. D. air. 32. An important feature of a prism that disperses light is that A. the speed of light is constant. B. light travels in straight lines without bending. C. reflection inside glass can be total. D. light of different frequencies travels at different speeds in glass. 33. When white light passes through a prism, green light is bent more than A. blue B. violet. C. red light.
3 34. According to the Heisenberg uncertainty principle, it is impossible to know at the same time exactly where an electron is and how fast it is moving, even with perfect measuring instruments. A) True B) False 35. The photoelectric effect supports the A. particle view of light. B. wave view of light. C. wave view of matter. 36. The ratio of a photon s energy to its frequency is A. its speed. B. its wavelength. C. its amplitude. D. Planck s constant. 37. A quantum of light is called a A. proton. B. photon. C. both of these. 38. Spectral lines take the shape of lines A. because the light is vertically polarized. B. they are images of the slit in the spectroscope. C. energy levels in the emitter are parallel to one another. 39. Discrete spectral lines occur when excitation occurs in a A. solid. B. liquid C. gas. D. All of them 40. The strong force acts between a. protons. B. neutrons. C. nucleons.d. all of these. 41. All the radiation we normally receive annually from natural sources is a fraction of 1 rem. Lethal doses of radiation begin at A. 5 rems. B. 50 rems. C. 500 rems. D rems. 42. Chain reactions in a fission reaction are caused by A. the kinetic energy of the decay products. B. the enormous energy of the reaction. C. the conversion of mass to energy. D. ejected neutrons. 43. When energy is released by the process of fission or fusion, the total mass of the material after the event is A. less. B. the same. C. more. D. none of these. 44. The element with the least mass per nucleon in its composition is A. hydrogen. B. helium. C. iron. D. uranium. 45. The equation that most underlies energy release in nuclear events is A. E = hf. B. E = 1 2 mv 2. C. E = Fd. D. E = mc 2. Problems: 10 points each. Show your work. Box your final answer. NEATNESS COUNTS. 1. Two tuning forks produce sounds of wavelengths 3.4 meters and 3.3 meters. Approximately what beat frequency is produced in Hz? Take the speed of sound to be 343 m/s
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