# What are electromagnetic waves?

What are electromagnetic waves?
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Warkallent8
Electromagnetic waves are non elastic waves in the sense that they don't really need a material medium for their propagation like sound waves do.
EM waves, as I shall call them are basically perpendicularly oscillating electric and magnetic fields propagating in space.
Their velocity in a particular medium is determined thus by the electrical and magnetic properties of the medium.
In vacuum, they propagate with a velocity approximately given as $c=3\ast {10}^{8}m{s}^{-1}$
In presence of material medium their velocity is smaller than this and is given as $v=\left(ϵ\mu {\right)}^{-\frac{1}{2}}$ where $ϵ$ is the electrical permittivity and $\mu$ is the magnetic permeability.