physics

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. λ= c/f =>
    f = c/ λ =3•10^8/4•10^-2 =7.5•10^-9 Hz,
    t =2•s/c =2•4800/3•10^8=3.2•10^-5 s.

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