Question: A photon with a wavelength in the visible region (between 400 and 700 nm) causes a transition from the n to the (n + 1)

A photon with a wavelength in the visible region (between 400 and 700 nm) causes a transition from the n to the (n + 1) state in doubly ionized lithium (Li2+). What is the lowest value of n for which this could occur?

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