EXAM3-2008key - EXAM III INTRODUCTION TO MATERIALS SCIENCE...

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EXAM III INTRODUCTION TO MATERIALS SCIENCE - MSE 150 SPRING 2008 HONOR CODE I PLEDGE MY HONOR THAT I HAVE NEITHER GIVEN OR RECEIVED AID ON THIS EXAMINATION. SIGNATURE _________________________ PRINT NAME _________________________ CAST YOUR VOTE TO DECIDE WHETHER THERE WILL BE A BONUS QUIZ ON MONDAY, APRIL 21, 2008 YES ______ NO ______ DO NOT TURN THIS PAGE UNTIL 10:10 AM YOU HAVE 50 MINUTES TO COMPLETE THIS EXAM 1
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(10 points) Solid-state diffusion can be described by Fick’s First Law. What are the names and SI units for the following terms in Fick’s First Law? J D Diffusivity or Diffusion coefficient (m 2 /s) dC/dx Concentration gradient (atoms/m 3 *1/m) What is the thermodynamical driving force for diffusion? Concentration gradient (entropy is increasing) Fick’s Second Law is a second order differential equation. What diffusion condition does Fick’s Second Law describe (i.e., what is the term dC x /dt?)? Non-Steady State Thermal activated processes are exponential functions of temperature that can be described by the following equation: Rate of reaction = C e -Q/RT What is the name of this type of equation? Arrhenius What does the term Q represent? Activation Energy (4 points) For nucleation of a solid from the liquid: What is the thermodynamic driving force? Volume free energy What is the thermodynamic retarding force? Surface energy What is the name for nucleation that occurs on the surface of a container or on insoluble impurities? Heterogeneous How does undercooling below T m influence the size of a critical nucleus (r*)? r* decreases (12 points) The schematic diagram shows a NMOS field effect transistor. 2
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What do the letters MOS stand for?
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