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

  • question_answer
    A siren emitting sound of frequency 500 Hz is going away from a static listener with a speed of 50 m/sec. The frequency of sound to be heard, directly from the siren, is  [AIIMS 1999; Pb. PMT 2003]

    A)            434.2 Hz                                 

    B)            589.3 Hz

    C)            481.2 Hz                                 

    D)            286.5 Hz

    Correct Answer: A

    Solution :

               \[{n}'=n\,\left( \frac{v}{v+{{v}_{S}}} \right)=500\times \left( \frac{330}{300+50} \right)=434.2Hz\]


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