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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Oscillating electrons generate changing ____ fields. a. | electric | c. | radio | b. | magnetic | d. | both a and b | | | | |
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2.
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The
electromagnetic waves with wavelengths slightly longer than visible light are ____. a. | microwaves | c. | ultraviolet
waves | b. | infrared waves | d. | X rays | | | | |
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3.
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The
frequency of purple light is ____ that of yellow light. a. | higher
than | c. | the same
as | b. | lower
than | d. | faster
than | | | | |
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4.
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____
are used for medical imaging. a. | Ultraviolet waves | c. | X rays | b. | Infrared
waves | d. | Gamma
rays | | | | |
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5.
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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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6.
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Carrier waves are in the wavelengths of ____. a. | microwaves | c. | radio
waves | b. | infrared waves | d. | light waves | | | | |
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7.
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The
part of the electromagnetic spectrum usually used for communication is ____. a. | radio
waves | c. | ultraviolet
waves | b. | infrared waves | d. | gamma rays | | | | |
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