MATLS 1M03 - WebCT - Assignment 2 - Try 2

MATLS 1M03 - WebCT - Assignment 2 - Try 2 - WebCT Quiz...

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http://webct.mcmaster.ca/SCRIPT/MATLS_1M03_T2_07/scripts/student. .. 1 of 4 2/5/2007 3:07 PM View Results Name: AARON MURENBEELD Attempt: 2 / 3 Out of: 16 Started: February 3, 2007 11:41pm Finished: February 3, 2007 11:48pm Time spent: 6 min. 41 sec. Question 1 (1 point) Which of the following types of point defect would you expect to be the most mobile, meaning it would be easiest to move around in the structure? Student response: Correct Response Student Response Answer Choices a. self- interstitial atom b. vacancy c. substitutional solute d. interstitial solute General feedback: The mobility of a defect depends on its size (smaller is better) and the availability of sites for it to jump to. Sect. 4.3 of the text discusses both of these factors. Score: 1 / 1 Question 2 (1 point) True or False: A metal is more likely to dissolve in a host metal that has a lower valency. Student response: Correct Response Student Response Answer Choices a. True b. False General feedback: Other factors being equal, a metal will have more of a tendency to dissolve another metal of higher valency than one of a lower valency. ~ from page 69 of the text. Score: 1 / 1 Question 3 (1 point) The number of vacancies present in some metal at 917°C is 3.34 x 10 24 m -3 . Calculate the number of vacancies at 583°C (in m^-3) given that the energy for vacancy formation is 0.780 eV/atom. Assume that the density of the metal remains constant. Use scientific notation, significant figures in answer: 3 Student response: Not answered Correct answer: 1.72E23 (1.72 * 10 23 ) m^-3 General feedback: See section 4.2 in the text. Score: 0 / 1 ( Question not answered. ) Question 4 (1 point) For a Cu-Zn alloy that contains 22.15 at% Zn, what is the concentration of Cu (in wt%)? The atomic weights for Zn and Cu are 65.39 and 63.55 g/mol, respectively.
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This note was uploaded on 02/08/2010 for the course MATLS 1M03 taught by Professor Okon during the Winter '09 term at McMaster University.

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MATLS 1M03 - WebCT - Assignment 2 - Try 2 - WebCT Quiz...

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