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JIPMER Jipmer Medical Solved Paper-1995

  • question_answer
    A siren emitting sound of frequency 500 Hz is going away from static listener with a speed of 50 m/s. The frequency of sound to be heard directly from the siren is:            

    A)              286.5 Hz                                 

    B)              481.2 Hz

    C)                                     489.3 Hz   

    D)                                     434.2 Hz

    Correct Answer: D

    Solution :

    Here: Frequency of siren \[n=500\,Hz\] Speed of siren \[=50\text{ }m\text{/}s\] The frequency heard from siren when it is going away from listener \[n=\frac{v}{v+{{v}_{s}}}n=\left( \frac{330}{330+50} \right)500=434.2\,Hz\] (where \[\upsilon =\] velocity of sound = 330 m/s)


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