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The intensity of a sound wave gets reduc...

The intensity of a sound wave gets reduced by `20%` on passing through a slab. The reduction intensity on passage through two such consecutive slabs

A

`40%`

B

`36%`

C

`30%`

D

`50%`

Text Solution

Verified by Experts

The correct Answer is:
B
Intensity after passing through one slab
`I'=[I-(20)/(100)xxI]=[I-(I)/(5)]=(4I)/(5)`
So, intensity after passing though two slabs
`I''=[I'-(20)/(100)xxI']=(4I')/(5)=(16I)/(25)`
`%` decrease`=[((I-(16I)/(25)))/(I)]xx100=36%`
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CENGAGE PHYSICS ENGLISH-SOUND WAVES AND DOPPLER EFFECT-Single Correct
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