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the world > matter > physics > atomic physics > decomposition of light, spectrum > study of spectra > [noun] > measurements (2)
angstrom unit1881

A unit of length equal to one hundred-millionth of a centimetre (10−8 cm), used mainly to express wavelengths of electromagnetic radiation and…

Fresnel1939

(With lower-case initial letter.) A name occasionally used by spectroscopists for a unit of frequency equal to 1012 Hz (1012 cycles per second).

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更新时间:2024/12/24 13:46:40