5. what is the density of 4.5 ml of a liquid that has a mass of 1.3 grams?
a. 0.289 g/ml
c. 3.20 g/ml
b. 3.46 g/ml
d. 0.468 g/ml

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?