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JEE Main & Advanced Physics Wave Mechanics Question Bank Critical Thinking

  • question_answer
    Two identical wires have the same fundamental frequency of 400 Hz. when kept under the same tension. If the tension in one wire is increased by 2% the number of beats produced will be                                      [JIPMER 1999]

    A)            4    

    B)            2

    C)            8    

    D)            1

    Correct Answer: A

    Solution :

                       \[n\propto \sqrt{T}\] Þ \[\frac{\Delta n}{n}=\frac{1}{2}\frac{\Delta T}{T}\] Beat frequency \[=\Delta n=\left( \frac{1}{2}\frac{\Delta T}{T} \right)\,n=\frac{1}{2}\times \frac{2}{100}\times 400=4\]


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