A policeman buzz a whistle of frequency 400 Hz. A car driver is approaching the policemen. The speed of car is 72 kmh -1 . Find out the change in frequency experienced by the driver, when driver approaches the policemen and after he crosses the policemen. [Velocity of sound is 350 ms -1 ].
Text Solution
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Given, n = 400 Hz
v o = 72 kmh -1 = 72 × 
= 20 ms -1
v = 350 ms -1
Apparent frequency of a sound heard by policeman when he is moving towards stationary source of sound.
Now, the apparent frequency when policeman is moving way from stationary source of sound
Hence, the change in frequency
= 
= 45.7 Hz
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