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Physics-

General

Easy

Question

The intensity of sound gets reduced by 10% on passing through a slab. The reduction in intensity on passing through three consecutive slab is

30%
27.1%
20%
36%

The correct answer is: 27.1%

Reduction in intensity after passing through first slab is $90 divided by 100$
Of I=0.9I
After second slab, intensity
=90% of (0.9I)
=81% of I
=0.81I
After third slab, intensity =90% of (0.81I)
=72.9% of I
∴ reduction in intensity =27.1%

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