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NEET Sample Paper NEET Sample Test Paper-10

  • question_answer
    A stretched wire of some length under a tension is vibrating with its fundamental frequency. Its length is decreased by 45%, and tension is increased by 21%. Now its fundamental frequency (assuming linear mass density remains the same):

    A)  increases by 50% 

    B)  increases by 100%

    C)  decreases by 50%

    D)  decreases by 25%

    Correct Answer: B

    Solution :

    As, frequency, \[f=\frac{1}{2l}\,\sqrt{\frac{T}{\mu }}\] and     \[f'=\frac{1}{2\times 0.55l}\,\,\sqrt{\frac{1.21\,T}{\mu }}\,=\frac{1}{l}\,\sqrt{\frac{T}{\mu }}=2f\]


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