The defect of _______ results in confusion with the sound created next.

Hard materials used for sound insulation are good absorbers.

The intensity of sound is proportional to ______ of amplitude.

The sound insulation of plastered solid brick masonry walls varies as ______

Sound waves reflected at a convex surface are diminished.

The ________ of suitable type may be used to distribute air inside the room.

______________ is very important to control the noise pollution near an Auditorium area.

Which of the following is not a characteristic of sound?