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Question

Sound of frequency 1000 Hz from a stationary source is reflected from an object approaching the source at 30ms−1, back to a stationary observer located at the source.The speed of sound in air is 330ms−1.The frequency of the sound heard by the observer is

A
1200Hz
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B
1000Hz
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C
1090Hz
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D
1100Hz
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Solution

The correct option is A 1200Hz
Frequency recieved by approaching car
f1=f0(1+30330)Hz
where f0=1000Hz
f1=1000(1+111)Hz
Frequency recieved by source again
f2=f1130330=1000(1+111)1111=1200Hz

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