According to International agreement, the frequency is measured in ____

The _____ are the substances which allow moisture to stay on their surfaces.

Hard materials used for sound insulation are good absorbers.

Sound travels faster in gases than in solids.

The ____________ is defined as the number of pressure variation which a sounding body makes in each unit of time.

For an echo to be distinguished as separate, it should reach the ear _____ of a second after the direct sound.

The amount of sound transmitted outside a room depends on the surface while the amount of sound reflected or absorbed de…

The recommended volume for a public lecture hall is _______