If the velocity of sound is V, velocity ...

If the velocity of sound is V, velocity of the observer is `V_(0)` and the velocity of the source is `V_(s)`, then the necessary condition for the Doppler effect to hold good is -

`V_(s) ge v, V_(0) gt V`

`V_(s) ge V, V_(0) lt V`

`V_(s) lt V, V_(0) gt V`

`V_(s) lt V, V_(0) lt V`

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