Technician pool, section T3B

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Subelement T3

RADIO WAVE PROPAGATION

Section T3B

Electromagnetic wave properties: wavelength vs frequency, nature and velocity of electromagnetic waves, relationship of wavelength and frequency; Electromagnetic spectrum definitions: UHF, VHF, HF

T3B01

What is the relationship between the electric and magnetic fields of an electromagnetic wave?

A.
They travel at different speeds
B.
They are in parallel
C.
They revolve in opposite directions
Correct Answer
D.
They are at right angles

T3B01

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T3B02

What property of a radio wave defines its polarization?

Correct Answer
A.
The orientation of the electric field
B.
The orientation of the magnetic field
C.
The ratio of the energy in the magnetic field to the energy in the electric field
D.
The ratio of the velocity to the wavelength

T3B02

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T3B03

What are the two components of a radio wave?

A.
Impedance and reactance
B.
Voltage and current
Correct Answer
C.
Electric and magnetic fields
D.
Ionizing and non-ionizing radiation

T3B03

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T3B04

What is the velocity of a radio wave traveling through free space?

Correct Answer
A.
Speed of light
B.
Speed of sound
C.
0.86 times the speed of light
D.
1.86 times the speed of sound

T3B04

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T3B05

What is the relationship between wavelength and frequency?

A.
Wavelength gets longer as frequency increases
Correct Answer
B.
Wavelength gets shorter as frequency increases
C.
Wavelength is constant at all frequencies
D.
Wavelength and frequency increase as path length increases

T3B05

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T3B06

What is the formula for converting frequency to approximate wavelength in meters?

A.
Wavelength in meters equals frequency in hertz multiplied by 300
B.
Wavelength in meters equals frequency in hertz divided by 300
C.
Wavelength in meters equals frequency in megahertz divided by 300
Correct Answer
D.
Wavelength in meters equals 300 divided by frequency in megahertz

T3B06

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T3B07

In addition to frequency, which of the following is used to identify amateur radio bands?

Correct Answer
A.
The approximate wavelength in meters
B.
Traditional letter/number designators
C.
Channel numbers
D.
All these choices are correct

T3B07

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T3B08

What frequency range is referred to as VHF?

A.
30 kHz to 300 kHz
Correct Answer
B.
30 MHz to 300 MHz
C.
300 kHz to 3000 kHz
D.
300 MHz to 3000 MHz

T3B08

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T3B09

What frequency range is referred to as UHF?

A.
30 to 300 kHz
B.
30 to 300 MHz
C.
300 to 3000 kHz
Correct Answer
D.
300 to 3000 MHz

T3B09

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T3B10

What frequency range is referred to as HF?

A.
300 to 3000 MHz
B.
30 to 300 MHz
Correct Answer
C.
3 to 30 MHz
D.
300 to 3000 kHz

T3B10

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T3B11

What is the approximate velocity of a radio wave in free space?

A.
150,000,000 meters per second
Correct Answer
B.
300,000,000 meters per second
C.
300,000,000 miles per hour
D.
150,000,000 miles per hour

T3B11

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T3B12

Which of these frequencies travels at the highest velocity in free space?

A.
Microwaves
B.
UHF
C.
VHF
Correct Answer
D.
All radio frequencies travel at the same velocity

T3B12

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