E E 339 - Midterm #1 Fall 2010 - Solutions

E E 339 - Midterm #1 Fall 2010 - Solutions - ECE 339 Fall...

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1 ECE 339, Fall 2010, first in-class exam Sign and print your name in space provide below, providing last the name by which you are alphabetize at UT. ( Do not provide social security number or similar.) Sign Name:________________________________________________ Print Name:________________________________________________ Further instructions/information: o There are a total of 100 points on the test as indicated. o If you show your work where appropriate I will give partial credit assuming your work was partially correct including full credit for incorrect answers resulting solely from prior errors. o Please be concise but do not expect full credit for ambiguous or incomplete answers. o For your sake as well as mine, write legibly ; I can’t give credit for what I can’t read. o I have attempted to provide sufficient information perhaps occasionally more than sufficient information to solve each problem … but you may check with me if you think something is missing; I’m obviously not in infallible. o On multiple choice questions, be sure to note the difference between "circle the correct answer" and "circle each correct answer" questions. o I have attempted to leave enough room often more than enough room to answer the questions in the body of the exam. You may also use the backs of preceding pages; just indicate on the original page that you have done so. Do NOT use your own scratch paper! o The equations from the inside front cover of the text and the definitions of commonly used symbols from Appendix I are provided at the end of this exam (for easier tearing off as needed). o You are NOT allowed to use a calculator! (Calculations if any should be simple.) o Also and some of the following information may be useful : k B T = 25.9 meV (or, equivalently, k B T/q = 25.9 mV) at 300K, The magnitude of the charge on an electron, q , is 1.602 x 10 -19 Coulombs (or, equivalently, 1/ q = 6.242 x 10 18 /Coulombs). Planck’s constant = h = 2 πħ =4.14 x 10 –15 eV-seconds.
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2 Problem 1 (12 point) A (4 points) If the state of a quantum mechanical particle and all particles are quantum mechanical, really is evolving in time within a system with a time-independent potential energy, then we can be sure that it did not start off in an eigenstate of what physical observable (a physical observable simply being anything that can be measured/observed)? answer: ___________________________________________________________ B (4 points) Which if any of the following can only accurately be explained using quantum mechanics ? (Circle each correct answer if any.) photons the existence of silicon crystals the transparency of diamonds holes (as charge carriers) C (4 points) Which proper noun phrase makes the following sentence correct ? (Circle the correct answer) : Indistinguishability among identical Fermions such as electrons leads to the Uncertainty Principle
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This note was uploaded on 11/07/2011 for the course E E 339 taught by Professor Leonardregister during the Spring '11 term at University of Texas.

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E E 339 - Midterm #1 Fall 2010 - Solutions - ECE 339 Fall...

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