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One source of sound moves towards statio...

One source of sound moves towards stationary listener with a speed, `(1)/(10)` times speed of sound. Ratio of frequency of sound heard by listener to that emitted from source is .......

A

`10/9`

B

`11/10`

C

`((11)/(10) )^(2)`

D

`((9)/(10)) ^(2)`

Text Solution

Verified by Experts

The correct Answer is:
A

We have, `(f _(L))/( v+ v _(L)) = (f _(S))/( v +v _(S))`
`therefore (f _(L))/( f _(S))= (v + v _(L))/( v + v _(S)) = (v + 0)/( v - (v)/( 10 )) = (v)/( 9v//10 ) = (10)/(9)`
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