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Q.

A person going away from a gate keeper on a scooter at a speed of 10 m/s blows a horn of frequency 600 Hz. If speed of sound is 340 m/s find the apparent frequency heard by the gatekeeper.

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a

617 Hz

b

583 Hz

c

600 Hz

d

550 Hz

answer is B.

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Detailed Solution

Here source is moving away from the observer so apparent frequency n′=vv+vsnWe have vs = 10 m/s n = 600 Hz , v = 340 m/sn′=340340+10×600=583Hz
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