Chapter 4: Wavelength & Frequency

What are the two components of a radio wave?

• Impedance and reactance

• Voltage and current

• Electric and magnetic fields

• Ionizing and non-ionizing radiation

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

• They travel at different speeds

• They are in parallel

• They revolve in opposite directions

• They are at right angles

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

• Speed of light

• Speed of sound

• Speed inversely proportional to its wavelength

• Speed that increases as the frequency increases

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

• 150,000 meters per second

• 300,000,000 meters per second

• 300,000,000 miles per hour

• 150,000 miles per hour

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What is the unit of frequency?

• Hertz

• Henry

•  Farad

• Tesla

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What describes the number of times per second that an alternating current makes a complete cycle?

• Pulse rate

• Speed

• Wavelength

• Frequency

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What is the relationship between wavelength and frequency?

• Wavelength gets longer as frequency increases

• Wavelength gets shorter as frequency increases

• Wavelength and frequency are unrelated

• Wavelength and frequency increase as path length increases

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What does the abbreviation “RF” mean?

• Radio frequency signals of all types

• The resonant frequency of a tuned circuit

• The real frequency transmitted as opposed to the apparent frequency

• Reflective force in antenna transmission lines

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

• Wavelength in meters equals frequency in hertz multiplied by 300

• Wavelength in meters equals frequency in hertz divided by 300

• Wavelength in meters equals frequency in megahertz divided by 300

• Wavelength in meters equals 300 divided by frequency in megahertz

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

• The approximate wavelength in meters

• Traditional letter/number designators

• Channel numbers

• All these choices are correct

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