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

  • question_answer
    A source of sound of frequency 500 Hz is moving towards an observer with velocity 30 m/s. The speed of sound is 330 m/s. the frequency heard by the observer will be  [MP PET 2000; Kerala PMT 2005; UPSEAT 2005]

    A)            550 Hz                                     

    B)            458.3 Hz

    C)            530 Hz                                     

    D)            545.5 Hz

    Correct Answer: A

    Solution :

               \[n'=n\,\left( \frac{v}{v-{{v}_{S}}} \right)\Rightarrow n'=500\,\left( \frac{330}{330-30} \right)=550\]\[Hz\].


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