NEET Sample Paper NEET Sample Test Paper-9

  • question_answer
    A racing car moving towards a cliff sound its horn, the driver observe that the sound reflected from the cliff has a frequency one octave higher than the actual frequency of the horn. If V is the velocity of sound, then the velocity of the car is:

    A)  \[\frac{V}{2}\]                      

    B)  \[\frac{V}{\sqrt{2}}\]

    C)  \[\frac{V}{4}\]                      

    D)  \[\frac{V}{3}\]

    Correct Answer: D

    Solution :

    Incase of reflection from a stationary cliff. \[f'=\left( \frac{V+{{V}_{0}}}{V-{{V}_{0}}} \right)f=2f\] \[{{V}_{0}}=\frac{V}{3}\]

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