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Two sound sources emitting sound each of...

Two sound sources emitting sound each of wavelength `lambda` are fixed at a given distance apart. A listener moves with a velocity `u` along the line joining the two suorces. The number of beats heard by him per second is

A

`(2u)/lambda`

B

`u/lambda`

C

`u/(3 lambda)`

D

`(2lambda)/(u)`

Text Solution

Verified by Experts

The correct Answer is:
A
frequency heard by listener

`n_1 = (V - u)/V V/lambda " " n_2 = (V + u)/V V/lambda`
Beat frequency = `n_2 - n_1 = (2u)/lambda`
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