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Question

A source of sound emitting 1200 Hz note travels along a straight line at a speed of 170ms1. A detector is placed at a distance 200 m from the line of motion of the source. The frequency of the sound received by the detector when it is closest is (velocity of sound is 340ms1

A
1600 Hz
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B
800 Hz
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C
2400 Hz
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D
none of these
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Solution

The correct option is A 1600 Hz
f1vv+vsf=340510×1200=800Hz;
f2=vvvsf=340170×=2400Hz
f=f1+f22=800+24002=1600Hz.

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