AnswersNC-Physical Science CR 2024Unit Test

Radio Waves and Applications Answers

9 verified answers
1
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In 2010, scientists obtained an image of an asteroid that was dangerously close to Earth. Which technology did the scientists likely use to capture the image?

A
GPS, because it uses satellites that provide position and velocity data
B
radio telescope, because it captures radio waves from space
C
MRI, because it uses magnets to produce a picture
D
submarine communication, because it uses LF radio waves
2
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Which two technologies use the same range of radio wave frequencies?

A
television broadcasting and AM radio broadcasting
B
cell phones and space communication
C
CB radios and submarine communication
D
AM and FM radio broadcasting
3

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

A
amplitude
B
frequency
C
phase
D
pulse
5

What type of modulation is typically used by broadcasting stations to transmit pictures on television screens?

A
amplitude
B
frequency
C
phase
D
pulse
6

Savanna drew a diagram to show how radio waves are modified for use in the field of broadcasting.

Question illustration
A
The label at the top of the diagram should be “FM Radio,” not “Cell Phone.”
B
The FM carrier waves should have different frequencies than the carrier waves, not different amplitudes.
C
The carrier wave should be on the right of the modulator, not on the left of the modulator.
D
The modulator should be labeled “Amplitude modulator,” not “Frequency modulator.”
7

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

A
The frequency of the radio waves used is so high that the waves cannot be used to target specific cells.
B
The wavelength of the radio waves used is so short that the waves cannot be used to target specific cells.
C
The amount of energy carried by radio waves is enough to provide images but not enough to kill cells.
D
The amount of energy carried by radio waves is so high that it provides images but can also damage cells.
8

Which terms describe the purpose of antennas on devices that use radio waves?

A
transmit and receive
B
modify and amplify
C
amplify and receive
D
modify and transmit
9

The diagram shows a device that uses radio waves.

Question illustration
A
modulate, amplify, and send out waves
B
capture, amplify, and demodulate waves
C
change the amplitude and frequency of waves
D
change the pulse and phase of waves
10

Which technology uses low frequency (LF) radio waves?

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

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