Due to their short wavelengths,
they are suitable for the radar systems used in aircraft navigation Radar
also provides the basis for the speed guns used to time fast balls, tennis-
serves, and automobiles Microwave ovens are an interesting domestic
application of these waves In such ovens, the frequency of the microwaves
is selected to match the resonant frequency of water molecules so that
energy from the waves is transferred efficiently to the kinetic energy of
the molecules