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Suppose that the n=10 state of He+ decays to the n=4 state in about 0.0079s. The...

Suppose that the n=10 state of He+ decays to the n=4 state in about 0.0079s. The n=4 state decays to the ground state in about 6.0e-9 s. Suppose you build a laser in which the gain medium consists of singly ionized helium, using the previously described quantum states, what is the wavelength of light produced by this laser?
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