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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