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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > hydrogen line > Balmer line
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Balmer line comparison table
Subject has discoverer has upper energy level has dicovery date occurs in has wavelength has antonym
H alphaJoseph Fraunhofer31814Sun6563 Åemission line
H betaJoseph Fraunhofer41814Sun4861 Åemission line
H delta 6  4101 Å 
H gamma 5  4342 Å 

Next hydrogen lineBrackett line    Uphydrogen line, spectral series line    Previous hydrogen linePfund line