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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 36

  • question_answer
    An observer moves towards a stationary source of sound of frequency n. The apparent frequency heard by him is 2n. If the velocity of sound in air is 332 m/sec, then the velocity of the observer is-

    A) \[166\text{ }m/sec\]       

    B)        \[~664\text{ }m/sec\]

    C) \[332\text{ }m/sec\]    

    D)        \[1328\text{ }m/sec\]

    Correct Answer: C

    Solution :

      [c] \[n'=n\left( \frac{v+{{v}_{0}}}{v} \right)\Rightarrow 2n=n\left( \frac{v+{{v}_{0}}}{v} \right)\] \[\Rightarrow \frac{v+{{v}_{0}}}{v}=2\] \[\Rightarrow {{v}_{0}}=v=332\text{ }m/sec\]


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