Wavelengths

Wavelength names are generally in lower case:

infrared     ultraviolet     gamma   but   X-ray [with a hyphen and a capital X]

Wavelength is often designated by lambda (λ). The SI unit for wavelength is the metre (m) – wavelengths are often expressed in nanometres (nm).

The ultraviolet (UV) region of the electromagnetic spectrum (with wavelengths between visible light and X‑rays) can be subdivided in a number of ways. One of these is based on the interactions of radiation of different wavelengths with biological materials:

UV-A [400–315 nm]

UV-B [315–280 nm]

UV-C [280–100 nm]

[Use a hyphen between the parts of the abbreviation.]

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