Reverberation time is directly proportional to ________

In winter, it becomes necessary to supplied slightly _____ air to the inside of the building.

Sound waves reflected at a convex surface are diminished.

If the direction of the wind is at 45° to one of the faces, negative pressure will be produced on ______

It is quite evident that the incoming air for ventilation should be ____ in summer and ____ in winter before it enters t…

The absorption ratio of a surface is the ratio of _______

_______________ defect is due to the lack of reflecting surfaces near the source of sound and excessive absorption of so…

In _________ system, some mechanical arrangement is adopted to provide enough ventilation to the room.