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Q.

The apparent frequency of the whistle of an engine changes in the ratio 3 : 2 as the engine passes a stationary observer. If the velocity of sound is 30 m/s, the velocity of the engine is

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a

33 m/s

b

44 m/s

c

66 m/s

d

55 m/s

answer is C.

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Detailed Solution

f1=f01−VVS and f2=f01+VVS where VS=Velocity of sound.∴ f1f2=V+VSVS−V⇒330+V330−V=32⇒V=66 m/s
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