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Q.

When a train approaches a stationary observer the apparent frequency of its whistle is n1. When the train recedes the observer the frequency is n2. When the observer is in the train the frequency heard will be

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a

2n1n2n1−n2

b

2n1n2n1+n2

c

Zero

d

n1n22

answer is D.

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Detailed Solution

n1=VV−VSnn2=VV+VSn

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