Ultraviolet
Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light, but longer than X-rays, that is, in the range 10 nm to 400 nm, corresponding to photon energies from 3 eV to 124 eV. It is so-named because the spectrum consists of electromagnetic waves with frequencies higher than those that humans identify as the colour violet. These frequencies are invisible to humans, but visible to a number of insects and birds.
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Famous quotes containing the word ultraviolet:
“As if the musicians did not so much play the little phrase as execute the rites required by it to appear, and they proceeded to the necessary incantations to obtain and prolong for a few instants the miracle of its evocation, Swann, who could no more see the phrase than if it belonged to an ultraviolet world ... Swann felt it as a presence, as a protective goddess and a confidante to his love, who to arrive to him ... had clothed the disguise of this sonorous appearance.”
—Marcel Proust (1871–1922)
“Like ultraviolet rays memory shows to each man in the book of life a script that invisibly and prophetically glosses the text.”
—Walter Benjamin (1892–1940)