Sound
Sound is a wave motion, produced by a vibrating source.
A medium is necessary for the propagation of sound waves.
Sound is a longitudinal wave in which the particles of medium move along the direction of motion of wave.
The part or region of a longitudinal wave in which the density of the particles of the medium is higher than the normal density is known as compression.
The part or region of a longitudinal wave in which the density of the particles of the medium is lesser than the normal density is called a rarefaction.
The point of maximum positive displacement on a transverse wave is known as crest.
The point of maximum negative displacement on a transverse wave is known as through.
A wave or short duration which is confined to a small portion of a medium at any given time is known as a pulse.
The maximum displacement of particles of the medium from their mean positions during the propagation of a wave is known as amplitude of the wave.
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NCERT 9 Science