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JEE Main & Advanced Physics Wave Mechanics Question Bank Beats

  • question_answer
    A tuning fork gives 4 beats with 50 cm length of a sonometer wire. If the length of the wire is shortened by 1 cm, the number of beats is still the same. The frequency of the fork is                                    [MP PMT 2001]

    A)            396

    B)            400

    C)            404

    D)            384

    Correct Answer: A

    Solution :

               \[n\propto \frac{1}{l}\]Þ \[{{n}_{1}}{{l}_{1}}={{n}_{2}}{{l}_{2}}\]Þ \[(n+4)49=(n-4)50\Rightarrow n=396\]


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