Question

Why are the walls of and roof of an auditorium covers with sound absorbent materials?

Answer 1

So, not to go voice outside of it.

Answer 2

the walls of roof of an auditorum is covered with sound absorbing materials because to stop the repiction of the sound which is also called reverbtion .the repition of a sound many times is called reverbtion.the sound asborbing material like curtains trees etc stop it too be be repeat