A 64 ft by 220 ft church sanctuary with 22 ft high ceilings has walls with an

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A 64 ft by 220 ft church sanctuary with 22 ft high ceilings has walls with an absorption coefficient (1000 Hz) of 0.09, ceiling with an absorption coefficient of 0.24, and seating (unoccupied) with an absorption coefficient of 0.35.
a. Approximate the reverberation time.
b. Approximate the reverberation time if the church sanctuary is occupied (floor absorption coefficient of 0.60).

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