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bn:03447259n
Noun Concept
Categories: Emission spectroscopy, Physical cosmology, All Wikipedia articles written in American English, Articles with short description, Hydrogen physics
EN
hydrogen line  21-centimetre radiation  1420 MHz  21-centimeter line  21-centimeter radiation
EN
The hydrogen line, 21 centimeter line, or H I line is a spectral line that is created by a change in the energy state of solitary, electrically neutral hydrogen atoms. Wikipedia
Definitions
Relations
Sources
EN
The hydrogen line, 21 centimeter line, or H I line is a spectral line that is created by a change in the energy state of solitary, electrically neutral hydrogen atoms. Wikipedia
A spectral line Wikipedia Disambiguation
Spectral line of hydrogen state transitions Wikidata
A spectral line of atomic hydrogen having a wavelength of about 21cm; used extensively in radio astronomy. Wiktionary
IS A
spectrum line
Wikipedia
EN
hydrogen line
Wikidata
EN
hydrogen line
Wiktionary
EN
hydrogen line
Wikipedia Redirections
EN
1420 MHz, 21-centimeter line, 21-centimeter radiation, 21-centimetre line, 21-centimetre radiation, 21-Centimetre Radiation, 21-cm line, 21-cm radiation, 21-cm radio wave, 21 centimeter radiation, 21 centimetre radiation, 21 cm line, 21 cm radiation, 21cm line, 21cm radiation, Hydrogen line/history1, hydrogen spin-flip, Hydrogen spin flip, neutral hydrogen, Neutral hydrogen line, Twenty-one cm line
Wikidata Alias
EN
21 centimeter line, 21 cm line, H I line, H one line, HI line

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