Accoustics of Buildings
Category : JEE Main & Advanced
Accounstics is the branch of physics that deals with the generation, propagation and reception of sound.
W.C. Sabine was the first to carry out the scientific study of architectural acoustics by laying down following rules.
The sound must be loud enough.
The quality of sound must be unaltered.
The successive sounds of speech or music must remain distinct.
These should not be unnecessary interference or resonance of sound in the auditorium.
These should be no echoes in the auditorium.
(1) Reverberation : Phenomenon of persistence or prolongation of sound in the auditorium is called reverberation.
(2) Reverberation time : The time gap between the initial direct note and the reflected note upto the minimum audibility level is called reverberation time.
(3) Sabine law : Sabine derived an expression of the reverberation time which is \[t=K.\frac{V}{\alpha S}\]; where K is constant, V = Volume of the hall, S = Surface area exposed to the sound \[\alpha \] =Co-efficient of absorption.
(4) Controlling the reverberation time : It may be controlled as follows :
By hanging heavy curtains on the doors.
By having few open windows in the hall.
By having large audience.
By using absorbing materials in the walls and roofs of the hall.
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