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  • The intensity of sound gets reduced by 20 % on passing through a slab. The reduction in density on passing through two consecutive sabs is -Option: 1 <p

The intensity of sound gets reduced by 20 % on passing through a slab. The reduction in density on passing through two consecutive sabs is -

Option: 1

40 %


Option: 2

36 %


Option: 3

30 %


Option: 4

50 %


Answers (1)

best_answer

\mathrm{ 100 \stackrel{\text { first }}{\text { slab }}>80 \stackrel{\text { second slab }}{\longrightarrow} 80 \% \text { of } 80=64 }

\mathrm{ \therefore } Reduction in intensity on passing through  two slabs = 36 % 

Posted by

Irshad Anwar

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