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Meaning of hydrogen line | Babel Free

Noun CEFR B2

Definitions

a spectral line of atomic hydrogen having a wavelength of about 21cm; used extensively in radio astronomy

CEFR level

B2

Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.

See also

hydrogen maser atomic clock hydrogen monoxide hydrogen nitrate hydrogen oxide hydrogen peroxide hydrogen phosphate