box with sides of length 3.5 Å and containing 6 7-electrons. What wavelength of light would be required to promote an electron from the ground state to the first excited electronic state? Answer 135 nm Hint: Use the result for the energy of a particle in a 2-d box: Enz ny (5.1) 2me L? 9.8 × 10-31kg You need with ng = 1, 2, 3... and ny = 1, 2, 3... and me the first 3 energy levels for the 6e¯, and the transition energy will be the enerov betwveen the HOMO and the LUMO (the 4th energy level).
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