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JEE Main & Advanced Physics Wave Mechanics Question Bank Doppler's Effect

  • 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                                    [MP PET 1990]

    A)            166 m/sec                              

    B)            664 m/sec

    C)            332 m/sec                              

    D)            1328 m/sec

    Correct Answer: C

    Solution :

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


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