单词 | Fraunhofer lines |
释义 | Word Frequency Fraunhofer lines(German ˈfraunhoːfər) plural noun a set of dark lines appearing in the continuous emission spectrum of the sun. It is caused by the absorption of light of certain wavelengths coming from the hotter region of the sun by elements in the cooler outer atmosphere Word origin named after J. von Fraunhofer (1787–1826), German physicist |
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