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

  • question_answer
    A source and an observer are moving towards each other with a speed equal to \[\frac{v}{2}\] where \[v\] is the speed of sound. The source is emitting sound of frequency n. The frequency heard by the observer will be                      [MP PET 2003]

    A)            Zero                                         

    B)            \[n\]

    C)            \[\frac{n}{3}\]                     

    D)            \[3n\]

    Correct Answer: D

    Solution :

               \[n'=n\left( \frac{v+{{v}_{0}}}{v-{{v}_{s}}} \right)=n\,\left( \frac{v+v/2}{v-v/2} \right)=3n\]


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