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A car is moving towards a high cliff. The car driver sounds a horn of frequency f. The reflected sound heard by the driver

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 frequency 2f. If v be the velocity of sound, then the velocity of the car, in the same velocity units, will be (a) v /2 (c) v /3 (b) v /2 (d) v /4

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