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JEE Main & Advanced Physics Wave Mechanics Question Bank Musical Sound

  • question_answer
    Intensity level of a sound of intensity I is 30 dB. The ratio \[\frac{I}{{{I}_{0}}}\] is (Where \[{{I}_{0}}\] is the threshold of hearing) [KCET 1999; J & K CET 2005]

    A)            3000                                         

    B)            1000

    C)            300

    D)            30

    Correct Answer: C

    Solution :

               \[L=10{{\log }_{10}}\left( \frac{I}{{{I}_{0}}} \right)=30\Rightarrow \frac{I}{{{I}_{0}}}={{10}^{3}}\]


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