The complete absorption spectrum of hydrogen atoms, based on the
energy-level transitions shown on page 34, is diagramed above. Each
line on this spectral diagram represents one absorption, or transition
upward between quantum states, and the letters beside some of the
lines correspond to the lettering of vertical transition lines on
the energy-level diagram.
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If subscripts L and U signify the lower and upper quantum levels
between which a transition occurs, then the energy difference is:
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