When a force of 2.4 newtons is applied to a spring, the extension is 0.4 m. What is the spring constant? 6 N/m
9.6 N/m
2 N/m
2.4 N/m

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 4.81 nm?