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

  • question_answer
    A source of sound is travelling with a velocity 40 km/hour towards observer and emits sound of frequency 2000 Hz. If velocity of sound is 1220 km/hour, then what is the apparent frequency heard by an observer   [AFMC 1997]

    A)            2210 Hz                                   

    B)            1920 Hz

    C)            2068 Hz                                   

    D)            2086 Hz

    Correct Answer: C

    Solution :

               \[{n}'=n\,\left( \frac{v}{v-{{v}_{S}}} \right)=\frac{2000\times 1220}{(1220-40)}=2068\]\[Hz\]


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