The New Encyclopaedia Britannica, Volume 23Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 224
... spectra research 12 : 929h stellar spectra characteristics 2 : 241a forbidden transitions , those transitions be- tween nuclear or atomic states that have a low probability of occurrence . atomic spectra emissions 17 : 465f Forbin ...
... spectra research 12 : 929h stellar spectra characteristics 2 : 241a forbidden transitions , those transitions be- tween nuclear or atomic states that have a low probability of occurrence . atomic spectra emissions 17 : 465f Forbin ...
Page 288
... spectra of the elements are constant , whether the spectra is produced by the direct rays of the Sun or by the reflected light of the Moon and planets , by a gas , or by a heated metal in the laboratory . He was the first to use ...
... spectra of the elements are constant , whether the spectra is produced by the direct rays of the Sun or by the reflected light of the Moon and planets , by a gas , or by a heated metal in the laboratory . He was the first to use ...
Page 933
... spectra . In the 1860s the Italian astronomer Angelo Secchi distinguished four main spectral types of stars . In the 1880s , during the compilation of the Henry Draper Catalogue of stars , more types were distinguished and were ...
... spectra . In the 1860s the Italian astronomer Angelo Secchi distinguished four main spectral types of stars . In the 1880s , during the compilation of the Henry Draper Catalogue of stars , more types were distinguished and were ...
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