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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