Question

where and why are sounds obsorbing materials used

Answer 1

Answer:

The sound absorbing materials are used on the roofs and walls of auditoriums, concert halls, theatres, etc. as well as upholsteries choosen for these rooms are made of sound absorbing materials. In these places, excessive reverberation is highly undesirable.

Answer 2

Answer:

The sound absorbing materials are used on the roofs and walls of auditoriums, concert halls, theatres, etc. as well as upholsteries choosen for these rooms are made of sound absorbing materials. In these places, excessive reverberation is highly undesirable. Due to the presence of sound absorbing materials, the sound reflected from the rigid surfaces is absorbed by these materials and hence reverberation is subdued.