Hydrogen line

ID: hydrogen-line

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Hydrogen line by Wikipedia Bot 0 1970-01-01
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Hydrogen line by Ciro Santilli 36 Updated 2025-04-24 +Created 1970-01-01
21 cm is very long and very low energy, because he energy split is very small!
Compare it e.g. with the hydrogen 1-2 spectral line which is 121.6 nm!
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