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Subelement A
RADAR Principles
Section 2
Distance and Time
A radio wave will travel a distance of three nautical miles in:
  • 6.17 microseconds.
  • 37.0 microseconds.
  • 22.76 microseconds.
  • Correct Answer
    18.51 microseconds.
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One RADAR mile is how many microseconds?
  • 6.2
  • 528.0
  • Correct Answer
    12.34
  • 0.186

Each nautical mile traveled at the speed of light (161826 miles per second), takes approx 6 microseconds (1/161282). So a round trip takes approximately 12 microseconds to see the returned RADAR response

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RADAR range is measured by the constant:
  • Correct Answer
    150 meters per microsecond.
  • 150 yards per microsecond.
  • 300 yards per microsecond.
  • 18.6 miles per microsecond.
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If a target is 5 miles away, how long does it take for the RADAR echo to be received back at the antenna?
  • 51.4 microseconds.
  • 123 microseconds.
  • 30.75 microseconds.
  • Correct Answer
    61.7 microseconds.
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How long would it take for a RADAR pulse to travel to a target 10 nautical miles away and return to the RADAR receiver?
  • 12.34 microseconds.
  • 1.234 microseconds.
  • Correct Answer
    123.4 microseconds.
  • 10 microseconds.
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What is the distance in nautical miles to a target if it takes 308.5 microseconds for the RADAR pulse to travel from the RADAR antenna to the target and back.
  • 12.5 nautical miles.
  • Correct Answer
    25 nautical miles.
  • 50 nautical miles.
  • 2.5 nautical miles.
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