________________ are made of mats or screens of split wire or glass wool or such other material and coated with non dryi…

The coefficient of effectiveness decreases with the relative size of the larger opening.

Sound intensity is high at dead spots while it is low at sound foci.

Which of the following types of absorbents can absorb the sound of any frequency?

The general temperature difference between inside and outside of a room is not more than ________

The maximum rate of air change is ______

The intensity of sound is proportional to ______ of amplitude.

A ___________ is produced when part of the atmosphere is compressed suddenly.