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Two cars are approaching eachother each ...

Two cars are approaching eachother each moving with a speed v.Find beat frequency as heard by driver of one carboth are emitting sound of frequency `f_0`

A

`beat frequency = 2vf_0/c-v`

B

`beat frequency = 2vf_0/c+v`

C

`beat frequency = vf_0/c-v`

D

none

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