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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

A

`v//sqrt2`

B

`v//3`

C

`v//4`

D

`v//2`

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