A whistle is rotated in a horizontal circle. Is there any change in the sound of the whistle, heard by a person standing (i) at the centre of the circle (ii) outside the circle ?

Explanation

To solve the problem, we need to analyze the situation for both observers: one at the center of the circle and the other outside the circle. We will use the principles of the Doppler effect to understand how the sound changes for each observer.

### Step-by-Step Solution:

1. **Understanding the Setup**:
- A whistle (sound source) is rotating in a horizontal circle.
- We have two observers: one at the center of the circle and one outside the circle.

...