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| 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. |
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| 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. |
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| 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. |
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