A blowing whistle is performing a uniform circular motion in a horizontal circle of radius r. An observer standing outside the circular parth,

Options

A. will hear a sound of uniform pitch
B. will not hear any sound
C. will hear a sound of frequency which is once more and once less than the acutal frequency in one revolution of the whistle
D. will hear a sound of frequency which is twice maximum and twice minimum in one round of the whistle

Answer

C