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AMU Medical AMU Solved Paper-2002

  • question_answer
    A source of sound is moving away from a stationary observer with a speed equal to the speed of sound. The apparent frequency heard by the observer will be

    A) \[{{\text{n}}^{\text{2}}}\]                                           

    B)  \[\text{2n}\]

    C)   \[\frac{n}{2}\]                                

    D)  unchanged

    Correct Answer: C

    Solution :

                     From Dopplefs effect, the perceived frequency                 \[f=\left( \frac{c}{c+v} \right)f\] Given, \[c=v,\,\,f=n\] \[\therefore \]  \[f=\left( \frac{c}{2c} \right)n\,\,\Rightarrow \,\,f=\frac{n}{2}\]


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