See if this will help.
https://chem.libretexts.org/Textbook_Maps/Physical_and_Theoretical_Chemistry_Textbook_Maps/Map%3A_Physical_Chemistry_(McQuarrie_and_Simon)/03._The_Schrodinger_Equation_and_a_Particle_In_a_Box/3.5%3A_The_Energy_of_a_Particle_in_a_Box_is_Quantized
The delocalized electrons in a long-chain polyene exist in quantum states that can be reasonably approximated by the particle in a one-dimensional box model. The length L of the box is the end-to-end distance. Suppose one such polymer has a length L = 4.00 nm. How much energy in Joules does an electron emit when it falls from the level with n= 3 to the lowest energy level?
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