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Q.

A listener is at rest with respect to the source of sound. A wind starts blowing along the lime joining the source and the observer. Which of the following quantities do not change?

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a

Wave length

b

Frequency

c

Time period

d

Velocity of sound

answer is B.

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Detailed Solution

∵f′=Vsound ±V0+Vwind Vsound ∓Vsource +Vwind f∴f′=f
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