When metallic sodium is dissolved in liquid sodium chloride, electrons are released into the liquid. These dissolved electrons absorb light with a wavelength near 800 nm. Suppose we treat the positive ions (presumably Na+) surrounding an electron very crudely as defining a three-dimensional cubic box of length L, and we assume that the absorbed light excites the electron from the n=1 ground state to the n=2 excited state. Calculate the edge length L for this simple mode.
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