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A sound source is moving towards a stat...

A sound source is moving towards a stationary observer with 1/10 of the speed of sound. The ratio of apparent to real frequency is

A

`9/10`

B

`11/10`

C

`10/11`

D

`10/9`

Text Solution

Verified by Experts

The correct Answer is:
D
`f. = f_0 [(V_("sound") - V_("observer"))/(V_("sound") - V_("source"))]`
`V_0 = 0` [observer stationary]
`f. = f_0 [(v)/(V - V/10)]`
`f. = f_0 10/9`
`(f.)/(f_0) = 10/9`
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