A small source of sound vibrating at frequency 500 Hz is rotated in a circle of radius 100/π cm at a constant angular speed of 5.0 revolutions per second. A listener situates himself in the plane of the circle. Find the minimum and the maximum frequency of the sound observed. Speed of sound in air = 332 m s -1 .

Question

Philoid · Accepted Answer

The observer is situated on the plane of the circle. The maximum frequency will be when the source reaches him and minima will be when the source crosses him. Hence,

Here

f₀ = 500Hz

v= 332 ms^-1

Now,