AMU Medical AMU Solved Paper-2008

  • question_answer
    What is the fractional change in tension necessary in a sonometer of fixed length: produce a note one octave lower than before

    A)  \[\frac{1}{4}\]                                  

    B)  \[\frac{1}{2}\]

    C)  \[\frac{2}{3}\]                                  

    D)  \[\frac{3}{4}\]

    Correct Answer: D

    Solution :

                     From the relation,                 \[n=\frac{1}{2l}\sqrt{\frac{T}{m}}\]                         ?. (i)                 \[\frac{n}{2}=\frac{1}{2}\sqrt{\frac{T}{m}}\]                        ?. (ii) From Eqs. (i) and (ii), we get                 \[\frac{T}{T}=\frac{1}{4}\]                 \[1-\frac{T}{T}=1-\frac{1}{4}\]                 \[\frac{T-T}{T}=\frac{3}{4}\]


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