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A source of sound and a listener both ar...

A source of sound and a listener both are moving in the same direction,the source following the listener. If the respective velocities of sound ,source and listener are ` v, v_s and v_'//s` then the ratio of the actual frequency of the source and the apparent frequency as received by the listener is

A

` (v-v_l)/( v- v_ s) `

B

` (v-v_s)/( v-v_l) `

C

` (v-v_l)/( v+v_s) `

D

` (v+ v_s)/( v+v_l)`

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The correct Answer is:
C
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