Station 1: Ball rolling off the table 1. Draw a free-body diagram for the ball in the air.
2. In what direction is the ball accelerating as it falls?
3. Does the net force on the ball in the free-body diagram indicate the direction of acceleration of the ball?
Explain.

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