A ball is thrown upward. What can be said about the system? A. PE never = 0 because the ball was thrown.
B. Conservation of energy does not apply because the ball was
thrown.
C. KE will be at a maximum when the ball is at its highest point.
D. The ball can be considered an isolated system.

An electron is trapped at a defect in a crystal. the defect may be modeled as a one-dimensional, rigid-walled box of width 1.00 nm. (a) sketch the wavefunctions and probability densities for the n 1 and n 2 states. (b) for the n 1 state, nd the probability of nding the electron between x1 0.15 nm and x2 0.35 nm, where x 0 is the left side of the box. (c) repeat (b) for the n 2 state. (d) calculate the energies in electron volts of the n 1 and n 2 states