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Subelement A
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.
18.51 microseconds.
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One RADAR mile is how many microseconds?
• 6.2
• 528.0
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:
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.
61.7 microseconds.
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• 12.34 microseconds.
• 1.234 microseconds.
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.