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# Semiconductor Materials – 1 – 8

36. In intrinsic semiconductor :

(a) The electron density is twice the hole density
(b) The electron density is thrice the hole density
(c) The electron density is square root of the hole density
(d) The electron density is same as the hole density

Explanation
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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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38. At absolute zero temperature, an intrinsic semiconductor behaves like a :

(a) Conductor
(b) Insulator
(c) Semiconductor
(d) Other metals

Explanation
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39. Germanium and silicon are :

(a) Trivalent
(b) Tetravalent
(c) Pentavalent
(d) Covalent

Explanation
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40. A semiconductor has a resistivity which :

(a) Is smaller than 10-2 Ω-cm
(b) Is larger than 10-2 Ω-cm
(c) Varies between 10-2 Ω-cm and 10-9 Ω-cm
(d) None of the above