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Physics

An electron begins in the n = 7 orbital of a hydrogen atom. It then emits a photon of wavelength λ and falls to a lower energy level. Before it has a chance to change levels again, it absorbs a 10 eV photon and is ejected from the atom with a kinetic energy of 6.6 eV. What is the wavelength, λ, of the first photon emitted?

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