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9. (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
)=
1
e
(
E
−
E
F
)
/kT
+1
where
k
is the Boltzmann constant and
E
F
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 Fall '08
 SPRUNGER
 Physics, Energy

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