Posted by Kelsey on Friday, May 13, 2011 at 12:57pm.
E1 = energy to promote from 4s to 4p = hc/wavelength. Remember to convert mm to m.
E2 = energy to promote from 4s to infinity = 2.18E18(1/4^2 - 0)
E2-E1 = energy to promote from 4p to infinity.
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