2.8 KiB
2.8 KiB
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 (D)
What is the relationship between the electric and magnetic fields of an electromagnetic wave? #card
- A. They travel at different speeds
- B. They are in parallel
- C. They revolve in opposite directions
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D. They are at right angles
- T3B02 (A)
What property of a radio wave defines its polarization? #card
- 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
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D. The ratio of the velocity to the wavelength
- T3B03 (C)
What are the two components of a radio wave? #card
- A. Impedance and reactance
- B. Voltage and current
- C. Electric and magnetic fields
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D. Ionizing and non-ionizing radiation
- T3B04 (A)
What is the velocity of a radio wave traveling through free space? #card
- A. Speed of light
- B. Speed of sound
- C. Speed inversely proportional to its wavelength
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D. Speed that increases as the frequency increases
- T3B05 (B)
What is the relationship between wavelength and frequency? #card
- A. Wavelength gets longer as frequency increases
- B. Wavelength gets shorter as frequency increases
- C. Wavelength and frequency are unrelated
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D. Wavelength and frequency increase as path length increases
- T3B06 (D)
What is the formula for converting frequency to approximate wavelength in meters? #card
- 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
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D. Wavelength in meters equals 300 divided by frequency in megahertz
- T3B07 (A)
In addition to frequency, which of the following is used to identify amateur radio bands? #card
- A. The approximate wavelength in meters
- B. Traditional letter/number designators
- C. Channel numbers
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D. All these choices are correct
- T3B08 (B)
What frequency range is referred to as VHF? #card
- A. 30 kHz to 300 kHz
- B. 30 MHz to 300 MHz
- C. 300 kHz to 3000 kHz
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D. 300 MHz to 3000 MHz
- T3B09 (D)
What frequency range is referred to as UHF? #card
- A. 30 to 300 kHz
- B. 30 to 300 MHz
- C. 300 to 3000 kHz
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D. 300 to 3000 MHz
- T3B10 (C)
What frequency range is referred to as HF? #card
- A. 300 to 3000 MHz
- B. 30 to 300 MHz
- C. 3 to 30 MHz
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D. 300 to 3000 kHz
- T3B11 (B)
What is the approximate velocity of a radio wave in free space? #card
- A. 150,000 meters per second
- B. 300,000,000 meters per second
- C. 300,000,000 miles per hour
- D. 150,000 miles per hour