question_answer

 A sound absorber attenuates the sound level by 20 dB. The intensity decreases by a factor of  [AIEEE 2007]

A)  1000            

B)       10000

C)  10                               

D)  100

Correct Answer: D

Solution :

[d] Let intensity of sound be  and .

Loudness of sound initially

Later,

Given,