Question

walls and floors of cinema hall are covered with thick curtains and carpets why??????????????????????????

Answer 1

to decrease the reverberation.

Answer 2

The roofs of auditoriums are curved so that sound reaches all four corners after reflection. Excessive reverberation in an auditorium is unwelcome. To lessen reverberation, sound-absorbing materials such as curtains, carpets, and fake ceilings are employed. The phenomenon of sound persistence after it has been ceased as a result of successive reflections is known as reverberation.