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abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > hydrogen line > Brackett line > Br alpha

Br alpha
subject			fact

Br alpha	has wavelength 40512 Å
	is an instance of Brackett line
Brackett line	has lower energy level 4
spectral series line	has series limit
hydrogen line	has species hydrogen (H I)
spectral line	has transition
	has equivalent width
spectral feature	has width
	occurs in
radiation measurement	has unit radiation unit
number	has value