Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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The
speed of electromagnetic waves is ____. a. | greater in water than in air | b. | different for
each frequency in a vacuum | c. | 300,000 km/s in a vacuum | d. | less for light
than for X rays | | |
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2.
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Electromagnetic radiation with the shortest wavelengths is ____. a. | gamma
rays | c. | radio
waves | b. | ultraviolet waves | d. | infrared waves | | | | |
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3.
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Your
body needs ____ to make vitamin D. a. | infrared waves | c. | visible light waves | b. | microwaves | d. | ultraviolet
waves | | | | |
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4.
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Gamma
rays are dangerous because they ____. a. | break down molecules and cells | c. | fluoresce | b. | cause
sunburn | d. | cause food to
spoil | | | | |
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5.
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AM
wave frequencies are ____ FM frequencies. a. | higher than | c. | the same as | b. | lower
than | d. | both a and
b | | | | |
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6.
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FM
frequencies are in the range of ____. a. | radio waves | c. | infrared waves | b. | microwaves | d. | sonic
waves | | | | |
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7.
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Television uses ____ to transmit signals. a. | microwaves | c. | visible light
waves | b. | infrared waves | d. | radio waves | | | | |
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