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Hydrogen Atom: Line Spectra and the Bohr Model

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A singly ionized helium atom (He+) has only one electron in orbit about the nucleus. What is the radius of the ion when it is in the n = 3 excited state?

I have an idea of how to do the problem, but that is with hydrogen. Please help and thank you very much!

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This solution discusses how to measure the radius of an ion in the hydrogen atom.

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Line Spectra and the Bohr Model of a Hydrogen Atom

A singly ionized helium atom is in the ground state. It absorbs energy and makes a transition to the n = 3 excited state. The ion returns to the ground state by emitting two photons. What are their wavelengths?
(lowest energy photon)
(highest energy photon)

Any help is greatly appreciated and thank you!

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