monochromatic radiation

radiation characterized by a single frequency

NOTE 1 In practice, radiation of a very small range of frequencies which can be described by stating a single frequency.

NOTE 2 The wavelength in air or in vacuum is also used to characterize a monochromatic radiation. The medium must be stated.

Note 3 The wavelength in standard air is normally used in photometry and radiometry. See also "wavelength".

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