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

  • question_answer
    A Siren emitting sound of frequency 800 Hz is going away from a static listener with a speed of 30 m/s, frequency of the sound to be heard by the listener is (take velocity of sound as 330 m/s) [CPMT 1996; AIIMS 2002; Pb. PMT 2001]

    A)            733.3 Hz                                 

    B)            644.8 Hz

    C)            481.2 Hz                                 

    D)            286.5 Hz

    Correct Answer: A

    Solution :

               \[n'=n\,\left( \frac{v}{v+{{v}_{S}}} \right)=800\,\left( \frac{330}{330+30} \right)\,=733.33\,Hz\].


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