单词 | ultraviolet radiation |
释义 | > as lemmasultraviolet radiation 1. Lying beyond the violet end of the visible spectrum: the epithet of electromagnetic radiation (and of the part of the spectrum containing it) which has a wavelength shorter than that of violet light (about 420 nm.) and (in modern use) no shorter than that of the longest X-rays (of the order of 4 to 40 nm.). Frequently in ultraviolet ray, ultraviolet radiation. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > chromatism > [adjective] > ultraviolet ultraviolet1840 Wood1925 U.V.1928 1840 J. F. W. Herschel in Philos. Trans. (Royal Soc.) 130 20 As orange, indigo, and violet, vegetable tints, are used for those of the prismatic hues, I may be allowed to express by the epithet lavender the rays which produce the tint in question, rather for the purpose of abbreviating the uncouth appellation of ultra-violet..than for that of laying any undue stress on the observed fact. 1870 J. Tyndall Notes 9 Lect. on Light 36 As regards the ultra-violet rays; when they are permitted to fall upon certain substances..they render the substance luminous. 1875 tr. H. W. Vogel Chem. Light & Photogr. vii. 60 We name the invisible tones of colour above violet ultra-violet, and those beyond red ultra-red. 1887 Encycl. Brit. XXII. 375/2 The remarkable series of ultra-violet lines..in the spectra of some stars. 1904 Sci. Siftings 12 Mar. 320/2 These ultra-violet rays..are most effective in the treatment of such diseases as tuberculosis of the skin, i.e., lupus. 1928 J. Galsworthy Swan Song i. xi. 84 They talk about these ultra-violet rays. Plain sunshine used to be good enough. 1935 Discovery Aug. 225/1 Those physical agents which have been found of service in the treatment of various diseases—such agents as ultra-violet and infra-red radiation. 1947 Sci. News 4 43 Ultra-violet light is a strong bleacher. 1955 Times 2 July 7/7 Ultra-violet radiation is useful, both to the naked eye and by photography, to determine whether varnish has perished. 1979 T. B. Akrill et al. Physics xviii. 248/1 The mercury vapour spectrum also includes a considerable amount of ultra-violet radiation. < as lemmas |
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