A 32 ft by 84 ft museum hall with 20 ft high ceilings has walls with an absorption coefficient (1000 Hz) of 0.09, ceiling with an absorption coefficient of 0.20, and seating (unoccupied) with an absorption coefficient of 0.35.
a. Approximate the reverberation time.
b. Approximate the reverberation time if the hall is occupied (floor absorption coefficient of 0.45).