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RAJASTHAN ­ PET Rajasthan PET Solved Paper-2005

  • question_answer
    The third harmonic of a closed organ pipe is in resonance with the fourth overtone of open organ pipe. The ratio of lengths of the pipes is

    A)  \[\frac{8}{7}\]              

    B)  \[\frac{7}{8}\]

    C)  \[\frac{3}{5}\]              

    D)  \[\frac{5}{3}\]

    Correct Answer: B

    Solution :

     According to question \[{{({{n}_{7}})}_{closed}}={{({{n}_{4}})}_{open}}\] \[7\times \frac{v}{4{{l}_{c}}}=4\left( \frac{v}{2{{l}_{o}}} \right)\] \[\frac{{{I}_{c}}}{{{I}_{o}}}=\frac{7}{8}\]


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