Question
The intensity of sound after passing through a slab decreases by $20 \%$. On passing through two such slabs, the intensity will decrease by(A) $50 \%$(B) $40 \%$(C) $36 \%$(D) $30 \%$
Step 1
If the intensity decreases by 20%, that means the remaining intensity is 100% - 20% = 80%. Now, let's consider passing through two slabs. After passing through the first slab, the intensity is 80% of the original intensity. When it passes through the second slab, Show more…
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