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Shane Macguire Grade: upto college level
        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 36.0 km h-1? Speed of sound in air = 340 m s-1.
3 years ago

Answers : (1)

Deepak Patra
askIITians Faculty
474 Points
										Sol. Here given, apparent frequency = 1620 Hz

So original frequency of the train is given by
1620 = (332 + 0 + 0/332 - 15) f ⇒ f = (1620 * 317/332) Hz
So, apparent frequency of the train observed by the observer in
F^1 = (332 + 0 + 0/332 + 15) f * (1620 * 317/332) = 317/347 * 1620 = 1480 Hz.
3 years ago
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