Distance travelled by a wave of
electromagnetic radiation in one cycle in vacuum.
Note:
SI unit: \(\pu{m}\). Common unit: \(\pu{nm}\) or \(\pu{\upmu\!m}\).
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 678 (https://doi.org/10.1515/pac-2019-0203)