A train stands at a platform, blowing a whistle of frequency 400 Hz in still aIr: What is the frequency of the whistle heard by a man running (a) towards the engine at `10 ms^(-1)` (b) away from the engine at 10 `ms^(-1)?`

Explanation

To solve the problem, we will use the formula for the apparent frequency of a sound wave when the source and observer are moving relative to each other. The formula is given by:

\[ f' = f \frac{v - v_0}{v - v_s} \]

where:
- \( f' \) = apparent frequency heard by the observer
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