Question

A whistle is being rotated in a horizontal circle. What will be the effect on the sound frequency for a listener standing outside the circle

Answer 1

When the whistle is rotating in the circle, the distance of the observer from the whistle varies .

For the listener observing the sound from outside the circle:

The frequency of the sound heard will be more than the actual frequency of whistle's sound when the whistle is coming close to the observer.

The frequency of the sound heard will be less than the actual frequency of whistle's sound when the whistle is coming close to the observer.