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

  • question_answer
    The frequency of a whistle of an engine is 600 cycles/sec is moving with the speed of 30 m/sec towards an observer. The apparent frequency will be (velocity of sound = 330 m/s)                                                     [MP PMT 1989]

    A)            600 cps                                   

    B)            660 cps

    C)            990 cps                                   

    D)            330 cps

    Correct Answer: B

    Solution :

               \[n'=n\,\left( \frac{v}{v-{{v}_{S}}} \right)=600\,\left( \frac{330}{300} \right)=660\]\[cps\]


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