Q.

A siren emitting sound of 1000 Hz is moving away from us towards a high hill with velocity 10 m/s. The frequency of sound reflected from the hill will be (V=330m/s)

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a

100Hz

b

130 Hz

c

1031.25Hz

d

1200Hz

answer is C.

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Detailed Solution

see fig n′=nvv−vs=1000×330330−10=1031⋅25Hz
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A siren emitting sound of 1000 Hz is moving away from us towards a high hill with velocity 10 m/s. The frequency of sound reflected from the hill will be (V=330m/s)