Mumbai university > FE > SEM 1 > Applied Physics 1

Marks: 5M

Year: Dec 2013

• Reverberation time is defined as the time interval between the initial direct note and the reflected note up to a minimum audibility level.

• More precisely, Reverberation time $(RT_{60})$ is defined as the time required, in seconds, for the average sound in a room to decrease by 60 dB after a source stops generating sound.

• Effective absorbing area is the product of Total surface area of the room and the co-efficient of absorption of the material of the room.

• Since only a part of the incident sound waves is absorbed by the surface, the effective surface area is used in the formula which gives us the equivalent surface area of the room which absorbs all the incident sound waves.

• This depends upon the absorption co-efficient of the surface.