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

  • question_answer
    An observer is moving away from source of sound of frequency 100 Hz. His speed is 33 m/s. If speed of sound is 330 m/s, then the  observed frequency is [EAMCET (Engg.) 1995; CPMT 1999]

    A)            90 Hz                                       

    B)            100 Hz

    C)            91 Hz                                       

    D)            110 Hz

    Correct Answer: A

    Solution :

               \[n'=n\,\left( \frac{v-{{v}_{O}}}{v} \right)=\left( \frac{330-33}{330} \right)\times 100=90\]\[Hz\]


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