A unit of length equal to one hundred-millionth of a centimetre (10−8 cm), used mainly to express wavelengths of electromagnetic radiation and…
| 单词 | θ78928 |
| 释义 | 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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