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CET Karnataka Medical CET - Karnataka Medical Solved Paper-2012

  • question_answer
    Intensity level of sound whose intensity is \[{{10}^{-8}}W{{m}^{-2}}\]is...dB

    A)  \[8\]     

    B)  \[4\]     

    C)  \[40\]    

    D)  \[80\]

    Correct Answer: C

    Solution :

    : Intensity level,  \[L=10\log \left( \frac{I}{{{I}_{0}}} \right)dB\] where  \[{{I}_{0}}\]= threshold intensity \[={{10}^{-12}}W{{m}^{-2}}\] Here, \[I={{10}^{-8}}W{{m}^{-2}}\] \[\therefore \] \[L=10\log \left( \frac{{{10}^{-8}}}{{{10}^{-12}}} \right)dB\] \[=10\log ({{10}^{4}})dB=40dB\]


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