The speed of sound is taken as ______

The formation of echoes can take place when the reflecting surfaces are located at a distance greater than ______

For lecture halls, large volumes are beneficial for weak sounds.

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

It is quite evident that the incoming air for ventilation should be ____ in summer and ____ in winter before it enters t…

In cavity wall construction for soundproofing, the width of the cavity should be at least _____

For working a temperature of 21 degree Celsius, range of 30% to 70% of ________ is desirable.

Sound travels faster in gases than in solids.