In the diagram, q1 = -3.33*10^_9 C and q2 = -5.22*10^_9 C. The electric field at
point P is zero. What is the distance
from P to q2?
91
92
?
0.255 m
(Remember, E points away from + charges,
and toward - charges.)
(Unit = m)

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