64. (a) The “home-base” energy level for the Balmer series is n= 2. Thus the transition with the least energetic photon is the one from the n= 3 level to the n= 2 level. The energy difference for this transition is ∆EE E=−=−−FHGIKJ=322213613121889...eVeVbgUsing hc= 1240 eV · nm, the corresponding wavelength is
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