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

  • question_answer
    The speed of sound in air at a given temperature is 350 m/s. An engine blows whistle at a frequency of 1200 cps. It is approaching the observer with velocity 50 m/s. The apparent  frequency in cps heard by the observer will be [CPMT 1976; RPET 1999; BHU 1997, 2001]

    A)            600

    B)            1050

    C)            1400                                         

    D)            2400

    Correct Answer: C

    Solution :

               \[n'=n\,\left( \frac{v}{v-{{v}_{s}}} \right)=1200\,\,\times \left( \frac{350}{350-50} \right)\]=1400 cps


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