A car is moving towards a high cliff. Th...

A car is moving towards a high cliff. The car driver sounds a horn of frequency `f`. The reflected sound heard by the driver has a frequency `2 f`. if v be the velocity of sound, then the velocity of the car, in the same velocity units, will be

`(v)/(sqrt2)`

`(v)/(3)`

`(v)/(4)`

`(v)/(2)`

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