20. (5 points) An unemployed science teacher decided to make a
house out of 2" (5 cm) pink foam
board. He made the house in the
shape of a box that was 3 meters
long, 2.6 meters wide, and 2 meters
high. How much power will an
electric heater need to keep the
house at 22°C (72°F) if the outside
air temperature is -2°C. You can
assume that the heat loss from
conduction is the main factor. (W)
[kpink foam = 0.03 W/m/°C]

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?