JEE Main & Advanced
Physics
Wave Mechanics
Question Bank
Numerical Value Type Questions - Doppler's Effect
question_answer
Microwaves which travel with the speed of light are reflected from a distant aeroplane approaching the wave source radar. It is found that when the reflected waves are beat against the waves radiated from the source, the beat frequency is 990 Hz. If the microwaves are 0.1 m in wavelength, what is the approaching speed (in m/s) of the aeroplane?