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Additional
dispersion relation
English Wikipedia - The Free Encyclopedia
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Dispersion relation
In
physical sciences
and
electrical engineering
,
dispersion relations
describe the effect of dispersion in a medium on the properties of a wave traveling within that medium. A dispersion relation relates the
wavelength
or
wavenumber
of a wave to its
frequency
. From this relation the
phase velocity
and
group velocity
of the wave have convenient expressions which then determine the
refractive index
of the medium. More general than the geometry-dependent and material-dependent dispersion relations, there are the overarching
Kramers–Kronig relations
that describe the frequency dependence of
wave propagation
and
attenuation
.
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