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finalexam

# finalexam - EMA 3413 Electronic Properties of Materials...

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EMA 3413 Electronic Properties of Materials Spring zAI1 Final Exam Exam time: Tuesday, Aprll26,12:30 pm to 2:30 pm (120 minutes) Location: MAEB 229 . This is a closed-book exam, but you are allowed to bring in a single-sided, letter-sized sheet of paper with handwritten information of your choice. o You are allowed to use a basic scientific calculator. . 100 total points plus 10 bonus points o Some physical constants that you may find useful and a part of the Period Table of Elements are given on the next page. o Some general guidelines for completing the exam: o Make sure you compile your answers to the questions in a formal way by using complete sentences instead of scattered words or phrases to explain your reasoning and justifi cations. o Provide sufficient middle steps in calculations and derivations. o Define the symbols and acronyms that you use, and/or illustrate on diagrams. o Pay attention to the units of various parameters. The unit should be provided as part of your answers. o For calculations, write down the equations first, perform equation derivations, and only plug in the values of the parameters for calculation at the final step. Honor Pledge: On my honor,I have neither given nor received unauthorized aid in completing this exam. NAME: S. L;fr-.-^'. (PRrNr) (Signature)

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Free electron mass: Atomic mass unit: Electron charge: Planck constant: Boltzmann constant: Vacuum permittivity: Vacuum permeability: Avogadro constant: Speed of light in vacuum: Physical constants m.: 9.1x10-" kg arnu: l.66xI0-27 kg e : 1 .6x 1O-le C h:6.63x10-3a J.s kn - 1.38x10-23 J/K es: 8.85x1 0-r2 Flm p6 : 4nx10-' Wm(or V.s/A.m, or kg.m/A2.s2) Na : 6.022* 1023 atoms/mol c:3x108 m/s Periodic'l'a ble r f ,Ulements {ti.om }Vikipectia } Grolrp --+ I Prriod 1 7 J g i g. g 7234 IA I'A 56 10 11 12 IllS IllF Lr8 Vt* vflB - l/*ttB * IB trE 13 14 15 t6 L7 18 lilA tvA \rA wA VltA viltA 1S N,e I8 A'. o I C]
1. Multiple choice questions. (3 points each, 18 total points) (1) The physical process that leads to light emission from a light-emitting diode is: A.

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