Physics 540 Fall 2005
Homework #2 Due Tuesday Sept. 13

1. Kittel p. 25 #1
2. Kittel p. 25 #2
3. Kittel p. 25 #3  I am not happy with Kittel's designation "non-equilibrium state" for states with n not equal to zero.  Mostly this is because the equilibrium state in the presence of the field does certainly have a non-zero expected value of n.  So I would replace his term by the alternate term "constrained state."  You may use the fact that W(n)=2N w(n) and use Eq. 6.8 for w(n).
4. Kittel p. 25 #4