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

  • question_answer
    A source is moving towards an observer with a speed of 20 m/s and having frequency of 240 Hz. The observer is now moving towards the source with a speed of 20 m/s. Apparent frequency heard by observer, if velocity of sound is 340 m/s, is      [CPMT  2000; KCET 2001; MH CET 2004]

    A)            240 Hz                                     

    B)            270 Hz

    C)            280 Hz                                     

    D)            360 Hz

    Correct Answer: B

    Solution :

               \[n'=n\,\left( \frac{v+{{v}_{O}}}{v-{{v}_{S}}} \right)=240\,\left( \frac{340+20}{340-20} \right)=270\,Hz\].


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