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JEE Main & Advanced Physics Wave Mechanics Question Bank Musical Sound

  • question_answer
    The intensity of sound wave while passing through an elastic medium falls down by 10% as it covers one metre distance through the medium. If the initial intensity of the sound wave was 100 decibels, its value after it has passed through 3 metre thickness of the medium will be                [CPMT 1988]

    A)            70 decibel                              

    B)            72.9 decibel

    C)            81 decibel                              

    D)            60 decibel

    Correct Answer: B

    Solution :

                       After passing the 3 meter intensity is given by \[{{I}_{3}}=\frac{90}{100}\times \frac{90}{100}\times \frac{90}{100}\times I=72.9%\ \text{of }I\] So, the intensity is 72.9 decibel.


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