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JEE Main & Advanced Physics Wave Mechanics Question Bank Vibration of String

  • question_answer
    The length of a sonometer wire tuned to a frequency of 250 Hz is 0.60 metre. The frequency of tuning fork with which the vibrating wire will be in tune when the length is made 0.40 metre is                                 [JIPMER 2002]

    A)            250 Hz                                     

    B)            375 Hz

    C)            256 Hz                                     

    D)            384 Hz

    Correct Answer: B

    Solution :

                 \[{{n}_{1}}{{l}_{1}}={{n}_{2}}{{l}_{2}}\Rightarrow 250\times 0.6={{n}_{2}}\times 0.4\Rightarrow {{n}_{2}}=375\]\[\Rightarrow {{n}_{2}}=375Hz\]


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