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15 April, 23:56

A certain radar installation tracks airplanes by transmitting electromagnetic radiation of wavelength 4.0 cm.

a) Find the frequency of this radiation. b) Find the time required for a pulse of radar waves to reach an airplane 4.8 km away and return.

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  1. 16 April, 03:26
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    the wavelength equation is

    speed (of light in this case) = wavelength (m) x frequency

    3x10^8m/s /.07m = f

    frequency = 4 285 714 286 hertz

    b) Total distance = 4.8 km (4,800 m)

    Speed = 3x10^8 m/s

    d=st

    t = d/s

    t = 4,800 m/3x10^8m/s

    t = 1x10^-5 seconds
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