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

  • question_answer
    A police car horn emits a sound at a frequency 240 Hz when the car is at rest. If the speed of the sound is 330 m/s, the frequency heard by an observer who is approaching the car at a speed of 11 m/s, is :                                      [UPSEAT 2004]

    A)            248 Hz                                     

    B)            244 Hz

    C)            240 Hz                                     

    D)            230 Hz

    Correct Answer: A

    Solution :

               Frequency heard by the observer            \[{n}'=n\,\left( \frac{v+{{v}_{0}}}{v} \right)=240\,\left( \frac{330+11}{330} \right)=248Hz.\]


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