Some singers can produce a loud note of a particular frequency such that it vibrates the glass so much that it shatters. This is due to a phenomenon of sound known as resonance.

Thin-walled glass goblets can vibrate when hit by sound waves. From this, we can conclude that the loudness increases with the area of the vibrating body and vice versa. But if the vibrating tuning fork is placed vertically on the surface of a bench, we will hear a louder sound. If we strike a tuning fork on a rubber pad, a feeble sound will be heard. For example, the sound produced by a large drum is louder than that by a small one because of its large vibrating area. The loudness of the sound also depends upon the area of the vibrating body. Similarly, when we beat a drum forcefully, the amplitude of its membrane increases and we hear a loud sound. The sound produced by a star will be loud if we pluck its wires more violently. The loudness of the sound varies directly with the amplitude of the vibrating body.

Some of them are discussed below: The amplitude of the vibrating body: The loudness of a sound depends upon a number of factors. “Loudness is the characteristic of sound by which loud and faint sounds can be distinguished.”When we talk to our friends, our voice is low, but when we address a public gathering our voice is loud. Sounds of different objects can be distinguished on the basis of different characteristics as described below: Loudness

Unlike light waves which are electromagnetic in nature, sound waves cannot pass through a vacuum. Sound waves are mechanical in nature in that they require a medium through which to move. Rarefactions are places where air pressure is slightly lower than the surrounding air pressure. Compressions are places where air pressure is slightly higher than the surrounding air pressure. For sound waves in the air, compression and rarefactions can be thought of as changes in air pressure.

Types of soundwaves