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COE in SHM

The intensity...

Question

The intensity of sound gets reduced by $10 %$ on passing through a slab. The reduction in intensity on passing through two consecutive slabs would be

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Solution

On passing the slab, the remaining intensity is $90 %$ of incident intensity.
So, after passing through two slabs, remaining intensity is $I_{R} = 0.9 (0.9 I_{o}) = 0.81 I_{o}$
Thus reduction in intensity is $19 %$

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