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

  • question_answer
    A source of sound emitting a note of frequency 200 Hz moves towards an observer with a velocity v equal to the velocity of sound. If the observer also moves away from the source with the same velocity v, the apparent frequency heard by the observer is                     [MP PMT 1990]

    A)            50 Hz                                       

    B)            100 Hz

    C)            150 Hz                                     

    D)            200 Hz

    Correct Answer: D

    Solution :

               Since there is no relative motion between observer and source, therefore there is no apparent change in frequency.


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