Use E = hc/λ and 1/λ = RZ

^{2}(1/n_{1}^{2}- 1/n_{2}^{2}) together.R = Rydberg constant

Z = atomic number (2 for He

^{+})n

_{1}= 1, the ground state energy level.n

_{2}= ∞, for ionization.Multiply by N

_{A}(Avogadro's number) and divide by 1000 to get the final units.Francisco P.

tutor

Find 1/λ from the second equation then multiply it by hc to get the energy. hc is the same from the photoelectron problem. I hope that clear up things.

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11/03/14

Trenda M.

11/03/14