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Q.

A police car horn emits a sound at a frequency 240 Hz when the car is at rest. If the speed of the sound is 330 m/s, the frequency heard by an observer who is approaching the car at a speed of 11 m/s, is :

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a

248 Hz

b

244 Hz

c

240 Hz

d

230 Hz

answer is A.

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Detailed Solution

Frequency heard by the observern'=n v+v0v=240 330+11330=248 Hz.

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A police car horn emits a sound at a frequency 240 Hz when the car is at rest. If the speed of the sound is 330 m/s, the frequency heard by an observer who is approaching the car at a speed of 11 m/s, is :