1. (a) At absolute temperature
T
= 0, the probability is zero that any state with energy
above the Fermi energy is occupied.
(b) The probability that a state with energy
E
is occupied at temperature
T
is given by
P E
e
E
E
kT
F
(
)
(
)/
=
+
−
1
1
where
k
is the Boltzmann constant and
E
F
is the Fermi energy. Now,
E –
E
F
= 0.0620 eV
and
5
(
)/
(0.0620eV) /(8.62
10
eV / K)(320K)
2.248
F
E
E
kT
−
−
=
×
=
,
so
2.248
1
(
)
0.0955.
1
P E
e
=
=
+
See Appendix B or Sample Problem 41-1 for the value of
k
.

This
** preview**
has intentionally

**sections.**

*blurred***to view the full version.**

*Sign up*