Materials will have different energies associated with the electrons inside them. This is related to how strongly bound they are by their work function. If we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. If this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. What is the lowest energy of an electron in the box if the thinnest direction across the materials is 3.98 nm?