Question

The intensity of sound wave gets reduced by 10% of initial level on passing through a slab.
The total reduction in intensity on passing through three consecutive slabs is
(1) 30%
(2) 70%
(3) 27.1%
(4) 72.9%​

Answer 1

Answer:

30 percent it is correct mark me as a brainleast

Answer 2

Answer:

My answer is 30. but it is wrong