# quiz2 - 6 Total distance traveled by an atom compared to...

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Home Introduction Policies Requirements & Grading Resources Syllabus Assignments Handouts Discussion Web Links Distance Learners Contact QUIZ#2 MSE 200 QUIZ#2 S. S. Number: Answer all questions. Choose the right answer in the parenthesis. Last question is bonus and you get free points for answering correctly. 1. Match the following with respect to formation of point defects a. Metals charge neutrality condition (b ) b. Ionic materials no charge neutrality condition (a ) 2. Concentration of vacancies in metals near their melting point is close to a. 1/10000 b. 1/100 c. 1/100000000 (a ) 3. A dislocation described by configuration at an extra half plane is a. a screw dislocation b. an edge dislocation c. a stacking fault (b ) 4. Match the following with respect to the orientation of the sense vector and Burgers vector in a dislocation

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a. screw dislocation perpendicular ( b) b. edge dislocation parallel (a ) 5. A grain boundary in a polycrystalline material is a. line defect b. a volume defect c. a surface defect (c )
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Unformatted text preview: 6. Total distance traveled by an atom compared to the root mean square distance is a. larger b. smaller c. equal (a ) 7. Arrhenius factor that describes the probability of successful jump of an atom over a barrier with free energy Gm is a. exp(-Gm/kT) b. exp(Gm/kT) c. 1 ( a) 8. Match the following with respect to mechanism of diffusion, a. substitutional atoms vacancy mechanism (a ) b.smaller atoms interstitial mechanism (b ) 9. The units of flux J used in diffusion are a. cm2/sec b. atoms/cm2.sec c.atoms/cm2 (b ) 10. Fick's second law of diffusion is obtained by applying a. conservation of mass b. conservation of energy c. random walk (a ) 11. Bonus question. Oxidation of metals, example rusting of iron and steel in atmosphere, takes place by diffusion of oxygen in an oxide layer. Which of the following equations will describe the thickness of the oxide layer, X formed after time t, a. X= constant. (t) b. X2=constant. (t) c. X=constant. exp(t).(b)...
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quiz2 - 6 Total distance traveled by an atom compared to...

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