Question

The persistence of sound on a big hall due to repeated reflections from the walls is called reverbreation.so,in order to reduce reverberation in big hall,suggest any two method

Answer 1

The hall is made circular from top so wave bounces between those walls up only and waves ends.
Install sound absorbent waves such as
hang drapes from ceiling and cover gloors with thick cloth mat.

Answer 2

The seat material are also selected on the basis of their sound absorbing property in the big hole

Fire board rough plastic or draperies are used in big hole .