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A source of sound and a listener are bot...

A source of sound and a listener are both 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_l` , then the ratio of the actual frequency of the source and the apparent frequency as received by the listener is

A

`frac(v-v_l)(v-v_s)`

B

`frac(v-v_s)(v-v_l)`

C

`frac(v+v_l)(v+v_s)`

D

`frac(v+v_s)(v+v_l)`

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