Question: Singly ionized helium is a hydrogen-like atom with a nuclear charge of 2e. Its energy levels are given by En = 4E0/n2, where E0 =

Singly ionized helium is a hydrogen-like atom with a nuclear charge of 2e. Its energy levels are given by En = –4E0/n2, where E0 = 13.6 eV. If a beam of visible white light is sent through a gas of singly ionized helium, at what wavelengths will dark lines be found in the spectrum of the transmitted radiation?

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