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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Electromagnetic waves ____. a. | are compressional waves | c. | must have a medium | b. | are transverse
waves | d. | are generated by
static electricity | | | | |
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3.
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The
____ of light determines whether a radiation will eject electrons. a. | frequency | c. | amplitude | b. | intensity | d. | speed | | | | |
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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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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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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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7.
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A
pager is a ____. a. | CRT | c. | cell | b. | cap code | d. | radio receiver | | | | |
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