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Chapter 18 Review
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1. In 1926, Michelson was able to measure the speed of light using A lanterns B stars. C mirrors D sunlight.
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2. To calculate the frequency of an electromagnetic wave, you need to know the speed of the wave and its A wavelength. B intensity. C refraction D amplitude.
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3. Because light travels in a straight line and casts a shadow, Isaac
Newton hypothesized that light is A radiation. B a stream of particles. C a wave. D heat.
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4. Electromagnetic waves vary in A the speed they travel in a vacuum. B wavelength and frequency. C the way they reflect. D their direction.
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5. Light acts like A a wave. B a particle. C both a wave and a particle. D neither a wave nor a particle.
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6. Photons travel outward from a light source in A a single straight line. B increasing intensity. C a small, dense area. D all directions.
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7. Infrared rays have a shorter wavelength than A ultraviolet rays. B X-rays. C radar waves. D gamma rays.
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A Far from the source, photons spread through a small area.
8. Which of the following occurs as light travels farther from its source? A Far from the source, photons spread through a small area. B The intensity of light increases as photons move away from the source. C The source gives off less light as photons move away from it. D Farther from the source, photons spread over a larger area.
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9. The waves with the longest wavelengths in the
electromagnetic spectrum are A infrared rays. B radio waves. C gamma rays. D X-rays.
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10. A translucent material A scatters some light. B transmits all light. C absorbs all light. D reflects all light.
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11. Cellular telephones utilize A radar waves. B very high frequency waves. C very low frequency waves. D microwaves.
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12. The visible light spectrum ranges between
A radar waves and X-rays. B television waves and infrared rays. C infrared rays and ultraviolet rays. D ultraviolet rays and gamma rays.
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13. Which of the following occurs
as a light wave bends when it passes from one medium into another? A constructive interference B refraction C destructive interference D reflection
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14. A material that reflects or
absorbs all of the light that strikes it is A translucent B opaque C black D white
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15. In order of increasing frequency,
the electromagnetic waves are radio waves, infrared waves, A microwaves, visible light, X-rays and gamma rays B visible light, UV rays, X-rays and gamma rays C gamma rays, X-rays, UV rays and visible light D gamma rays, X-rays, visible light and UV rays
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16. Objects appear fuzzy through a material that is A transparent B translucent C opaque D polarized
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17. Microwaves and radar are examples of A infrared waves B radio waves C X-rays D UV rays
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Answer Key C 7. C 13. B A 8. D 14. B B 9. B 15. B B 10. A 16. B
C 11. D 17. B D 12. C
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