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A sound absorber attenuates the sound le...

A sound absorber attenuates the sound level by `20 dB`. The intensity decreases by a factor of

A

`1000`

B

`10000`

C

`10`

D

`100`

Text Solution

Verified by Experts

The correct Answer is:
D
Let intensity of sound be `I` and `I'`
Loudness of sound initially
`beta_(1)= 10log(1/(I_(0)))`
Later,`beta_(2)= 10log((I')/(I_(0)))`
Given, `beta_(2)-beta_(1)= 20`
`:. 20=10log((I')/(I))`
`I'=100I`
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