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Punjab Medical Punjab - MET Solved Paper-2001

  • question_answer
    A siren emitting sound of frequency \[800\,\,Hz\] is going away from a stationary listener with the speed of\[30\,\,m/s\]. The frequency of sound to be heard directly from the siren is

    A) \[733.3\,\,Hz\]                 

    B) \[782.3\,\,Hz\]

    C) \[833.3\,\,Hz\]                 

    D)  none of these

    Correct Answer: A

    Solution :

    Here: Speed of siren\[{{v}_{s}}=30\,\,m/s\] Frequency of siren\[n=800\,\,Hz\] Now the frequency heard from siren is                 \[n=\left( \frac{v}{v+{{v}_{s}}} \right)n=\frac{330}{330+30}\times 800\] or            \[n=\frac{330}{360}\times 800=733.3\,\,Hz\]


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