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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2004

  • question_answer
    At what speed should a source of sound move so that stationary observer finds the apparent frequency equal to half of the original frequency?

    A)  \[\frac{v}{2}\]

    B)  \[2v\]

    C)  \[\frac{v}{4}\]

    D)  \[v\]

    Correct Answer: D

    Solution :

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


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