| 单词 | spectral line |
| 释义 | spectral line in American English any of a number of lines in a spectrum produced by the emission of electromagnetic radiation from an excited atom: a spectral line represents the energy difference between two energy levels spectral line in American Englishnoun Optics a line in a spectrum due to the absorption or emission of light at a discrete frequency Word origin [1865–70]This word is first recorded in the period 1865–70. Other words that entered Englishat around the same time include: batting average, black belt, goulash, racism, valenceExamples of 'spectral line' in a sentence |
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