When metallic sodium is dissolved in liquid sodium chloride, electrons are released into the liquid. These dissolved electrons absorb light with a...

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