### Compton wavelength

(lower bound on a particle's possible de Broglie wavelength)

A particle's **Compton wavelength** is a value used in
calculation of Compton scattering and some
other quantum-mechanical phenomena.
It is also used as a general threshold regarding the size
of interactions: that if the interaction is less than the
Compton wavelength, then quantum mechanical considerations
are necessary in its analysis.

h
λ = ——
mc

It is directly related to the inverse of the particle's mass,
the proportion the quotient of the two physical constants, h/c,
so it constitutes a type of measure of the particle's mass.
Also, it is a lower bound on a particle's possible
de Broglie wavelength, the latter of which depends upon the velocity
as well as its mass.
The above formula is like that of the de Broglie wavelength except
with the speed of light, c rather than the particle's velocity, v.

(*physics,quantum mechanics,mass,measure*)
**Further reading:**

http://en.wikipedia.org/wiki/Compton_wavelength

**Referenced by pages:**

fuzzy dark matter (FDM)

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