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Radio Waves and Applications — Quiz Answers

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1
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Which radio wave technologies would be unaffected by satellites that are not working properly?

A
radio telescopes and space communication
B
television broadcasting and GPS
C
MRI and radio telescopes
D
space communication and television broadcasting
2
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What type of modulation is typically used by broadcasting stations to transmit pictures on television screens?

A
amplitude
B
pulse
C
frequency
D
phase
3

Which best explains why an MRI is useful for diagnosing cancer but ineffective in treating it?

A
The amount of energy carried by radio waves is enough to provide images but not enough to kill cells.
B
The wavelength of the radio waves used is so short that the waves cannot be used to target specific cells.
C
The frequency of the radio waves used is so high that the waves cannot be used to target specific cells.
D
The amount of energy carried by radio waves is so high that it provides images but can also damage cells.
4

Suppose the microphone on an AM radio is not working properly. Which best explains how this will affect the process of amplitude modulation?

A
Sound waves will not be transformed into electrical signals.
B
The frequency of the carrier wave will be modified instead of the amplitude.
C
Electrical signals will not be transformed into sound waves.
D
The pulse of the carrier wave will be modified instead of the amplitude.
6

Which type of modulation is used by remote-control toys?

A
phase
B
pulse
C
frequency
D
amplitude
7

Which technology uses low frequency (LF) radio waves?

A
space communication
B
submarine communication
C
TV program broadcasting
D
FM radio broadcasting
9

How are amplitude modulation and frequency modulation techniques similar?

A
Both modify the pulse of a carrier wave.
B
Both transform electrical signals into sound waves.
C
Both are used by cell phones to produce images.
D
Both are used by radio stations to transmit sound.

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