The intensity of a sound wave gets reduced by 20% on passing through a slab The reduction in intensity on - Science - Sound

Question

The intensity of a sound wave gets reduced by 20% on passing
through a slab The reduction in intensity on passing through 2
consecutive slabs is ?

Neha Gupta · Accepted Answer

Let I0 is the initial intensityafter passing from one slab, intensity is given by:I =I0-I0×20100I = 4I05after passing through the second slab,I' = I-I×20100I' = I×80100I'=4I05×80100 =1625I0 therefore after passing through two sllabs intensity remains 64% of the initial value

The intensity of a sound wave gets reduced by 20% on passing through a slab.The reduction in intensity on passing through 2 consecutive slabs is ?