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

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

The absorption ratio of a surface is the ratio of _______

_______________ defect is due to poor sound insulation.

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

The ____________ plays an important role in the comfort of persons affected by ventilation system.

The width of the seats in an auditorium should be between ______

Combination system consist of supply system and ______ system.