JAMB - Physics (2007 - No. 15)
In a large telecommunications auditorium, perforated absorbent materials are used to line the ceiling so as to
Increase the reverberation of sound in the hall
increase the amount of echo in the hall
reduce the hight of the ceiling from the floor
reduce the reverberation of sound in the hall
توضیح
In a large auditorium perforated, absorbent materials are used to line the ceiling so as to reduce the effect of multiple reflection of echo called reverberation