The roof of movie theatre and a conference hall is curved
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It is curved so that the sound waves can bounce better.
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1) SOUND WAVES GET REFLECTED FROM THE WALLS AND ROOF MULTIPLE TIMES. THIS CAUSES A SINGLE SOUND TO BE HEARD NOT ONCE BUT CONTINUOUSLY. THIS IS CALLED REVERBERATION.
2) DUE TO REVERBERATION SOME AUDITORIUMS OR SOME PARTICULAR SEATS IN AN AUDITORIUM HAVE INFERIOR SOUND RECEPTION WHICH CAN BE COMPENSATED WITH CURTAINS.
3) CEILINGS OF THESE HALLS ARE MADE CURVED SO THAT SOUND AFTER REFLECTING FROM THE CEILING, REACHES ALL PARTS OF THE HALL AND QUALITY OF SOUND IMPROVES.
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