Your latest invention is a car alarm that produces sound at a particularly annoying frequency of 3500 hz . to do this, the car alarm circuitry must produce an alternating electric current of the same frequency. that's why your design includes an inductor and capacitor in series. the maximum voltage across the capacitor is to be 12.0 v . to produce a sufficiently loud sound, the capacitor must store an amount of energy equal to 1.65×10−2 j .

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?