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NEET Sample Paper NEET Sample Test Paper-3

  • question_answer
    If the tension and diameter of sonometer wire of fundamental frequency n is doubled and density is halved, then its fundamental frequency will become

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

    B)  \[\sqrt{2}n\]

    C)  \[n\]                    

    D)  \[\frac{n}{\sqrt{2}}\]

    Correct Answer: C

    Solution :

        Frequency of sonometer wire, \[n=\frac{p}{2rl}\sqrt{\frac{T}{\pi \rho }}\]                           ??..(i) When tension and diameter are doubled and density is halved, then                         \[n'=\frac{p}{2\times 2rl}\sqrt{\frac{T}{\pi \rho /2}}\]                                            \[=\frac{p}{2rl}\sqrt{\frac{T}{\pi \rho }}\]                             ??(ii) Comparing equations (i) and (ii), we get             \[n'=n\]              


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