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A traffic policeman standing on a road s...

A traffic policeman standing on a road sounds a whistle emitting the main frequency of 2.00 kHz. What could be the apparent frequency heard by a scooter driver approaching the policeman at a speed of `36.0km h^(-1) ?` Speed of sound in air `=340 m s^(-1).`

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The correct Answer is:
` 2 . 0 6 Hz`
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