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A racing car moving towards a cliff, sou...

A racing car moving towards a cliff, sounds its horn. The driver observes that the sound reflected from the cliff has a pitch one octave higher than the actual sound of the horn. If `v` is the velocity of sound, then the velocity of the car is

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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 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

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