Write short nots on (a) microwave

Explanation

Microwaves : It is produced by electromagnetic oscillators in electric circuits. The wavelength range is `1 xx 10^(-3)` m to `3 xx 10^(-1)` m and frequency range is 3 `xx 10^(11) Hz " to" 1 xx 10^(9)`Hz. It obeys reflection and polarization. If is used in radar system for aircraft navigation, speed of the vehicle,microwave oven for cooking and very long distance wireless communication through satellites.