Name: PRINT (Last name, First) Texas A&M; University Electrical and Computer Eng

Question

Name: PRINT (Last name, First) Texas A&M; University Electrical and Computer Engineering Department TEST #2 Fall 2017 ECEN 370 For each question, indicate your answer by circling one choice from the listed options 1. In the Kronig-Penney model for one dimensional periodic potential, the width of allowed energy bands for higher bands compared to lower bands is: (a) Wider. (b) Same. (c) Narrower. 2. In metals, the highest allowed occupied energy band is: (a) Totally full. (b) Nearly full. (c) Partially full. 3. Given that the total density of energy states in the highest allowed energy band is 2.5x101 cm Ifonly 7.2x10'1 states/cm3 are occupied by electrons within this band, how many electrons/cm will contribute to conduction and produce a current when an external electric field is applied? (a) 32.2x10 (b) 7.20x1019 (c) 17.8x1018 4. For electrons in the conduction band of a certain semiconductor that are at energy level "E" eV. What will be the free energy of those electrons within this band? (a) (Ec - E) ev (b) (E - Ev) ev (c) (E-Ec) ev. itincie IIt.V comnound GaP semiconductor

Explanation / Answer

1. same

2. in case of metals the highest energy band is partially filled

4.. the energy of electrons is Ec-E

please post 3 seperately..thanx

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