A sound detector is placed on a railway platform. A train, approaching the platform at a speed of `36 kmh^-1`, sounds its whistle. The detector detects 12.0 kHz is the most dominant frequency in the whistle. If the train stops at the platform and sounds the whistle, what would be the most dominant frequency detected? The speed of sound in air is `340 ms^1`.

Explanation

To solve the problem, we will use the Doppler effect formula for sound waves. The formula to determine the frequency detected when the source is moving towards the observer is given by:

\[ \nu' = \frac{V}{V - U_s} \cdot \nu_0 \]

Where:
- \(\nu'\) = observed frequency (12 kHz)
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