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A hall has a volume of 10000 m^(3). Its ...

A hall has a volume of `10000 m^(3)`. Its total absorption is equivalent to 400sq. M of an open window. What will be the effect on a reverberation time if audience fills the hall and increases the absorption by another 400sq. Metre of an open window?

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Reverberation time decreases from 4 s to 2 s
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