Question 1 Please indicate the temperatures that these n-type semiconductors (Si) are at. -?-?-?-?-?-?- $E_c$ $E_v$ T= T= T= [Select] [Select] [Select] 3 pts
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Q1. At temperatures near room temperature, the temperature dependence of the conductivity for intrinsic germanium is found to equal: σ = C exp(-Eg/2kT) where C is a temperature-independent constant and T is in Kelvins. a) Calculate the intrinsic electrical conductivity of germanium at 150°C. b) Determine the temperature at which the electrical conductivity of intrinsic germanium is 22.8 (Ω-m)⁻¹. Take note: σ(germanium) = 2.2 (Ω-m)⁻¹ at 25°C. Eg = 0.67eV.
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1-Intrinsic semiconductors are those : A)Which are available locally B)Which have zero energy gap C)Which are made of semiconductor material in its purest form (no other materials) D)Which have more electrons than holes 2-Intrinsic semiconductor at room temperature will have , .......... available for conduction : A)Non of them B)Both electrons and holes C)Holes D)Electrons 3- pure semiconductor behaves like an insulator at 0 K because : A) Drift velocity of free electrons is very small B) There is no recombination of electrons with holes C) Energy possessed by electrons at that low temperature is almost zero D) Free electrons are not available for current conduction 4-The energy gap is much more in silicon than in germanium because A) It has less number of electrons B) Its valence electrons are more tightly bound to their parent nuclii C) Its crystal has much stronger bonds called ionic bonds D) It has high atomic mass number
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