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A wave is a
disturbance in a medium.
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It carries energy from one
point to another without transferring matter.
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There are two main types:
Longitudinal and Transverse.
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Sound waves are an example
of longitudinal waves.
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Typically, sound waves
travel at about 340 meters per second in air at room temperature and
pressure.

We use three ways of representing the propagation of waves:
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Dots.
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Colour maps.
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Line graphs.
WAVELENGTH-FREQUENCY RELATION

Frequency,
f, wavelength,
λ,
and wave velocity,
v, are
mathematically related by:
v =
f λ
POINT SOURCES, INVERSE SQUARE
LAW

The energy carried by waves
that radiate uniformly in all directions from a point source decay as the
inverse of the square of the distance from the point source. This is known
as the inverse square law.
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