1. What is the commonly accepted frequency range of radio waves?
A.
3 Hz to 300 Hz
B.
3 kHz to 300 GHz
C.
300 GHz to 300 THz
D.
300 THz to 3000 THz
Correct Answer:
3 kHz to 300 GHz
Explanation:
Radio waves are commonly classified as electromagnetic waves with frequencies from about 3 kHz to 300 GHz.
2. Which of the following frequencies lies within the radio-wave frequency range?
A.
100 Hz
B.
10 kHz
C.
500 THz
D.
1 PHz
Correct Answer:
10 kHz
Explanation:
A frequency of 10 kHz lies between 3 kHz and 300 GHz, so it belongs to the radio-wave range.
3. The lower boundary of the commonly accepted radio-wave frequency range is approximately:
A.
3 Hz
B.
30 Hz
C.
3 kHz
D.
300 kHz
Correct Answer:
3 kHz
Explanation:
The radio-wave frequency range commonly begins at approximately 3 kHz.
4. The upper boundary of the commonly accepted radio-wave frequency range is approximately:
A.
3 MHz
B.
30 GHz
C.
300 GHz
D.
3000 GHz
Correct Answer:
300 GHz
Explanation:
The commonly accepted upper limit of the radio-wave range is approximately 300 GHz.
5. Which frequency is below the commonly accepted radio-wave range?
A.
2 kHz
B.
20 kHz
C.
2 MHz
D.
2 GHz
Correct Answer:
2 kHz
Explanation:
The radio-wave range starts at about 3 kHz, so 2 kHz is below this range.
6. Which frequency is above the commonly accepted radio-wave range?
A.
30 kHz
B.
30 MHz
C.
30 GHz
D.
3000 GHz
Correct Answer:
3000 GHz
Explanation:
Since the upper limit of the radio-wave range is about 300 GHz, 3000 GHz lies above it.
7. A radio wave has a frequency of 100 MHz. This frequency is:
A.
Below the radio-wave range
B.
Within the radio-wave range
C.
Above the radio-wave range
D.
Outside the electromagnetic spectrum
Correct Answer:
Within the radio-wave range
Explanation:
100 MHz is between 3 kHz and 300 GHz, so it lies within the radio-wave frequency range.
8. Which frequency is closest to the lower limit of the radio-wave range?
A.
1 Hz
B.
3 kHz
C.
3 GHz
D.
3 THz
Correct Answer:
3 kHz
Explanation:
The lower limit of the commonly accepted radio-wave frequency range is approximately 3 kHz.
9. Which frequency is closest to the upper limit of the radio-wave range?
A.
30 MHz
B.
3 GHz
C.
300 GHz
D.
300 THz
Correct Answer:
300 GHz
Explanation:
The upper limit of the commonly accepted radio-wave range is approximately 300 GHz.
10. A wave has a frequency of 1 GHz. According to the usual classification, it is a:
A.
Radio wave
B.
Microwave only and not a radio wave
C.
Visible-light wave
D.
Ultraviolet wave
Correct Answer:
Radio wave
Explanation:
A frequency of 1 GHz lies within the broad radio-wave range of approximately 3 kHz to 300 GHz.
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