A man stands still on a moving walkway and a woman walks past him in the same direction as the escalator. To a stationary observer, the man has a
speed of 0.3 m/s and the woman has a speed of 0.38 m/s. From the frame of
reference of the man on the escalator, how fast is the woman walking?
A. 0.68 m/s
B. 0.08 m/s
C. 0.3 m/s
D. 0.38 m/s

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?