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J & K CET Engineering J and K - CET Engineering Solved Paper-2004

  • question_answer
    The intensity of sound gets reduced by 10% on passing through a slab. The reduction in intensity on passage through three consecutive slabs is

    A)  \[30%\]        

    B)  \[27.1%\]

    C)  \[20%\]   

    D)  \[36%\]

    Correct Answer: B

    Solution :

    Reduction in intensity after passing through first slab is \[=\frac{90}{100}\] of \[I=0.9I\] After second slab, intensity  \[=90%\] of \[(0.9I)\] \[=81%\] of \[I\] \[=0.81I\] After third slab, intensity  \[=90%\]of \[(0.81\,I)\] \[=72.9%\] of \[I\] \[\therefore \]  Reduction in intensity \[=27.1%\]


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