Chapter 27 Review Test Questions – Flashcards
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Electromagnetic waves are... a. transverse waves. b. longitudinal waves
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A
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Electromagnetic waves a. need a medium to travel through. b. can travel through a vacuum.
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B
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Which of these electromagnetic waves has the shortest wavelength? a. Infrared waves b. Light waves c. Radio waves d. X-rays e. Ultraviolet waves
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D
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Compared to the wavelength of ultraviolet waves, the wavelength of infrared waves is a. the same. b. shorter. c. longer
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C
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Compared to the velocity of radio waves, the velocity of visible light waves is a. slower. b. faster. c. the same.
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C
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The source of all electromagnetic waves is a. magnetic fields. b. heat. c. electric fields. d. vibrating charges. e. none of the above
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D
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Which of the following are fundamentally different from the others? a. Gamma rays b. Radio waves c. Sound waves d. Light waves e. X-rays
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C
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The main difference between a radio wave and a light wave is its a. speed. b. wavelength. c. both A and B d. none of the above.
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B
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The main difference between a radio wave and a sound wave is its a. basic nature. b. amplitude. c. energy. d. frequency. e. wavelength.
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A
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If the sun were to disappear right now, we wouldn't know about it for 8 minutes because it takes 8 minutes a. to operate receiving equipment in the dark. b. for light to travel from the sun to Earth. c. for the sun to disappear. d. all of the above e. none of the above
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B
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When Roemer took measurements of one of Jupiter's moons (Io) moving behind Jupiter, he found his predicted time was off. Compared to when Earth was closest to Io, the predicted times when Earth was farthest from Io were a. late. b. early.
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A
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Which of the following is NOT an electromagnetic wave? a. Sound b. Radio c. Light d. Infrared e. X-ray
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A
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Heat lamps give off mostly a. X-rays. b. infrared waves. c. ultraviolet waves. d. microwaves. e. radio waves.
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B
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Compared to its speed in air, the speed of light in water is a. slower. b. the same. c. faster.
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A
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Glass is transparent to visible light, but not to a. ultraviolet. b. infrared. c. both a and b. d. none of the above
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C
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The shiny surfaces of metals have most to do with a. metals' relatively high density. b. a resonant frequency of electrons in the metal. c. the fact that light reflects from metals. d. the free electrons in metal atoms.
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D
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Clouds a. neither block nor transmit UV light. b. block UV light. c. transmit UV light
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C
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Electromagnetic waves with higher frequencies have wavelengths that are a. shorter. b. longer.
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A
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The shadow produced by an object held close to a piece of paper in sunlight will be a. sharp. b. fuzzy
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A
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Solar eclipses are seen less commonly than lunar eclipses because a. the sun is so much larger than the moon. b. the sun is farther from Earth than is the moon. c. solar eclipses don't happen as often as lunar eclipses. d. Earth's shadow on the moon is larger than the moon's shadow on Earth. e. none of the above
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D
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Light waves are a. longitudinal waves. b. transverse waves.
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B
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What is the ultimate source of electromagnetic waves? a. Vibrating atoms b. Vibrating molecules c. Radio sets d. Vibrating charged particles e. TV antennas
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D
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The primary purpose of polarized sunglasses is_____. a. to block ultraviolet rays. b. to block infrared rays. c. to block glare from reflections. d. to look cool.
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C
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Light does not pass through what kind of materials? a. transparent b. opaque c. neither a nor b
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B
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How far is a light-second? a. 5000 km b. 300,000 km c. 9,000,000 km d. 18,000,000 km e. 95,000,000,000 km
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B
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Light that reflects at glancing angles from nonmetallic surfaces, such as glass, water, or roads is a. polarized perpendicular to the surface. b. polarized parallel to the surface. c. randomly polarized.
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B
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Light reflected from a lake surface is polarized a. randomly. b. horizontally. c. vertically.
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B
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If an electron vibrates up and down 1000 times each second, it generates an electromagnetic wave having a a. frequency of 1000 Hz. b. speed of 1000 m/s. c. period of 1000 s. d. wavelength of 1000 m.
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A
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What is the wavelength of an electromagnetic wave that has a frequency of 1 Hz? a. More than 1 m b. Less than 1 m c. 1 m
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A
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What is the frequency of an electromagnetic wave having a wavelength of 300,000 km? a. More than 1 Hz b. Less than 1 Hz c. 1 Hz
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C
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After randomly polarized light passes through a polarizer, it is a. totally blocked. b. totally polarized. c. randomly polarized. d. partially polarized
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D
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Because of absorption, a polarizing filter will actually transmit 40% of incident nonpolarized light. Two polarizing filters with their axes aligned will transmit a. 0%. b. between 0% and 40%. c. 40%. d. between 40% and 100%. e. 100%.
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B
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If two polarizing filters are held with their polarization axes at right angles to each other, the amount of light transmitted compared to when their axes are parallel is a. zero. b. half as much. c. the same. d. twice as much.
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A
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An ideal polarizing filter will transmit 50% of nonpolarized light incident on it. How much light is transmitted by two ideal polarizing filters that are oriented with their axes parallel to each other? a. 0% b. Between 0% and 50% c. 50% d. Between 50% and 100% e. 100%
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C
