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The reverberation time is larger for an ...

The reverberation time is larger for an empty hall than for a crowded hall. Why ?

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In a crowded hall, each member of the audience absorbs sound and as such reverberation time decreases. In an empty hall, absorption of sound is due only to the walls, floor and the furniture etc.
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A hall has a volume of 10000 m^(3) . Its total absorption is equivalentto 400sq. M of an open window. What will be the effect ona reverberation time if audience fills the hall and increases the absorption by another 400sq. Metre of an open window?

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