m⁻¹
per meter
Wavenumberexact by definition
The reciprocal metre is the SI unit of wavenumber, the number of wave cycles per unit length, equal to the reciprocal of the wavelength. It is also used for attenuation and absorption coefficients, where it describes the fractional loss per metre of path. The relation to SI base units is exact by definition.
| 1 m⁻¹ | 1 m⁻¹ |