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, the velocity of the car will be
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, the velocity of the car will be
- A
$\frac{v}{{\sqrt 2 }}$
- B
$\frac{v}{2}$
- C
$\frac{v}{3}$
- D
$\frac{v}{4}$
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