Reverberation

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Due to reflection of light a sound created in a big hall will persist until it is reduced to a value where it is no longer audible.

This persistence of audible sound due to the successive reflections from the surrounding objects even after the source has stopped to produce that sound is called reverberation.

There should not be excessive reverberation. To reduce reverberation, the roof and walls of the auditorium are generally covered with sound- absorbent materials like compressed fibre -board, rough plaster or draperies.