أرسل بواسطة: جنين في ديسمبر 04, 2006, 01:06:39 صباحاً
Role in astronomy
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حيث n2 ≥ 3 و n1 = 2
The Balmer series is particularly useful in astronomy because the Balmer lines appear in numerous stellar objects due to the abundance of hydrogen in the universe. Astrophysicists are able to use the Balmer lines to help determine the age of stars because younger stars are composed almost entirely of hydrogen, while older stars have greater quantities of heavier elements due to nuclear fusion. All elements have unique spectral lines, so careful analysis of the absorption/emission lines can give clues to the relative age of stars.
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