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JEE Main & Advanced Sample Paper JEE Main Sample Paper-15

  • question_answer
    A racing car moving towards a cliff sounds its horn. The driver observes that the sound reflected from the cliff has a frequency twice than the actual sound of the horn. If V = the velocity of sound, the velocity of the car is

    A)  \[V/\sqrt{2}\]                  

    B)  \[V/2\]

    C)  \[V/3\]                               

    D)  \[V/4\]

    Correct Answer: C

    Solution :

    \[\frac{C+V}{C-V}=2\] \[C+V=2C-2V\] \[3V=C\] \[V=\frac{C}{3}\]


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