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The intensity of sound wave while passin...

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

A

70 decibel

B

72.9 decibel

C

81 decibel

D

60 decibel

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The correct Answer is:
B
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