Page 2 - LN

 When an object vibrates in the air or produces a sound, some regions of high
pressure are created in front of it. These are called the Regions of Compression.

These regions of compression move forward in the medium as particles exert
pressure on their adjacent particles.
 With alternate regions of compression, there are also regions of low pressure that
are in its front. These are called Regions of Rarefaction.
 As the object would move forwards and backwards consecutively producing sound,
the series of compressions and rarefactions will be created. This will allow sound
to move through air or any other medium as well.

 If the medium is dense the pressure exerted on the particles will be more in order
to propagate the sound and vice versa.

 Therefore, we can also say that propagation of sound is all about change in the
pressure of the medium

The compression region is represented by the upper part of the wave curve.

Compression (C) It is a region where particles cluster together.

The density, as well as pressure, is always high in this region.

A refraction is represented by the lower part of the wave curve.

Refraction (R) It is a region where the particles separate out.

Refraction region always has lower pressure.

Crest It is the peak of the curve

Trough It is the crust of the curve