Question

Curved ceiling of a conference hall
What is the multiple reflection of sound

Answer 1

so that the sound may reverbrate and could be heareable in the whole hall.

multiple reflection of sound is called REVERBRATION

Answer 2

HAYA MATE ..

HERE IS YOUR ANSWER..

the multiple reflection of sound is called REVERBERATION....

And the ceilings of concert halls are curved because sound after the reflection from it reaches all the corners of the hall and should be audible to each person in the hall....

HOPE IT WILL BE HELPFUL TO YOU...