Calculate the transmission loss given the sound levels measured on either side of the wall is 60 dB and 40 dB.

The intensity of sound is proportional to ______ of amplitude.

_________ is the number of cycles made by a sounding body per unit time.

Colouring of sound quality is caused due to _____

Clean air should contain less than ______ of suspended impurity per cubic metre.

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

The adequate absorbing surfaces should be provided in the hall to control the ________

The term _____ is used to mean the free passage of clean air in a structure.