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NEET Sample Paper NEET Sample Test Paper-59

  • question_answer
    Two instruments having stretched strings are being played in unison. When the tension of one of the instruments is increased by 1%, 3 beats are produced in 2sec, the initial frequency of vibration of each wire is:

    A) 300Hz

    B) 500Hz 

    C) 100Hz                          

    D) 400Hz

    Correct Answer: A

    Solution :

                [a]  \[f=\frac{1}{2\pi }\sqrt{\frac{T}{\overset{o}{\mathop{\mu }}\,}}\] \[f\propto \sqrt{T}\] \[\frac{f-f}{f}\times 100K\frac{\sqrt{T-T}}{\sqrt{T}}\times 100\] \[\frac{3}{2{{f}_{o}}}=\frac{1}{2}\times 1%\] \[{{f}_{o}}=300Hz\]    


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