What is the mass of a crate if a net force of 12 n gives the crate an acceleration of 0.20 m/s2? 2.4 kg 6 kg 12.2 kg 60 kg

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?