posted by LL .
A radar installation that is used to track airplanes transmits electromagnetic radiation with a wavelength of 4 cm. Calculate the frequency of this radiation in Hz.
Calculate the time required for a pulse of radar waves to reach an airplane 4.0 km away and return.
f=c/λ=3•10^8/0.04 =7.5•10^9 Hz.
t=s/v=s/c= 4000/3•10^8 =1.33•10^-5 s.