14. Reviewing Sample Problem 32-1 before doing this exercise is helpful. Let
K =
3
2
kT =
µ·
B
− (−µ·
B)
= 2µB
which leads to
T =
4µB
3k
=
4(1.0
× 10
−23
J/T)(0.50 T)
3(1.38
J/K)
= 0.48 K .