A tuning fork of frequency 328 Hz is moved towards a wall at a speed of `2 ms^(-1)`. An observer standing on the same side as the fork hears two sounds, one directly from the fork and the other reflected from the wall. How many beats per second can be heard ? (Velocity of sound in air 330 ms)

Explanation

To solve the problem step by step, we will use the Doppler effect to find the apparent frequencies heard by the observer from the tuning fork and its echo.

### Step 1: Calculate the apparent frequency heard directly from the tuning fork (new dash)
The formula for the apparent frequency when the source is moving towards a stationary observer is given by:

\[ f' = f \frac{v}{v - v_s} \]
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