# Wavenumber

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Wavenumber, k, sometimes called the propagation number, is a quantification of spatial scale. It can be thought of as a spatial analog to the temporal frequency. It is often defined as the number of wavelngths per unit distance, or in terms of wavelength, λ:

${\displaystyle k={\frac {1}{\lambda }}\ }$

In some applications, the angular wavenumber is sought, and expressed in radians per metre:

${\displaystyle k={\frac {2\pi }{\lambda }}\ }$