# Semiconductor Materials – 37

37. The Fermi-Dirac probability function specifying all states at energy E (electron volts) occupied under the thermal equilibrium is given by :

(a) f(E) = KT – ln eE-Ef
(b) f(E) = 1 + eE-Ef
(c) f(E) = 1( 1 + e(E-Ef)/ kT)
(d) f(E) = ((E)/Ef)e-KT

Explanation
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