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Question

A person riding a car moving at 72 km/h sounds a whistle emitting a wave of frequency 1250 Hz. What frequency will be heard by another person standing on the road (i) in front of the car (ii) behind the car? Speed of sound in air = 340 m/s.

A

1250 Hz, 1181 Hz

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B

1328 Hz, 1181 Hz

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C

1620 Hz ,1080 Hz

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D

None of these

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Solution

The correct option is B 1328 Hz, 1181 Hz i)Given vs = 72 km/hour = 20 m/s, f = 1250 Apparent frequency when car is approaching a)For second case apparent frequency will be=(340+0340+20)×1250=1181Hz

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