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JIPMER Jipmer Medical Solved Paper-2004

  • question_answer
    A siren emitting sound of frequency 500 Hz is going away from a stationary listener with a speed of 50 m/s, the frequency of sound heard directly from the siren is:

    A)  286.5 Hz

    B)                                         481 Hz 

    C)         434.2 Hz             

    D)         580 Hz

    Correct Answer: C

    Solution :

    Here : Frequency of siren = 500 Hz The speed of siren \[{{\upsilon }_{s}}=50\,m\text{/}s\] Using Dopplers principle \[n=\frac{\upsilon }{\upsilon +{{\upsilon }_{s}}}n\] or            \[n=\left( \frac{330}{330+50} \right)\times 500\] or            \[n=\frac{330\times 500}{380}=434.2\,Hz\]


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