MTLS 1M03 Assignment 2 Attempt3

MTLS 1M03 - View Results Assignment 2(Ch 4 5 Name SOROUSH AKBARZADEH Started 4:47pm Attempt 1 3 Finished February 1 2009 2:44pm Out of 18 Time

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View Results Name: SOROUSH AKBARZADEH Attempt: 1 / 3 Out of: 18 Started: January 30, 2009 4:47pm Finished: February 1, 2009 2:44pm Time spent: 45 hr, 56 min., 23 sec. Question 1 (1 point) True or false? It is possible to produce a perfect crystalline solid that does not contain any vacancies. Student response: Correct Response Student Response Answer Choices a. True b. False General feedback: False . It is not possible to produce a solid material that is totally free of vacancy defects. Score: 1 / 1 Question 2 (1 point) _________________ point defects occur when impurity atoms fill the voids or interstices between host atoms in the crystal structure. Student response: No. Student response Grade Correct answer (Value) 1. interstitial 100% Answer evaluated by the formula. (100%) General feedback: Interstitial point defects involve impurity atoms filling the voids between atoms in the regular crystal lattice. See page 69 in the text. Score: 1 / 1 Question 3 (1 point) How many vacancies are present in a cubic meter of a material with the following properties at 884°C? The energy for vacancy formation is 1.46 eV/atom. The density of the material is 12.7 g/cm 3 . The atomic weight of the material is 124 g/mol. Use scientific notation, significant figures in answer: 3 Student response: 2.71e22 Correct answer: 2.71E22 (2.71 * 10 22 ) General feedback: See page 67-68 of the text book for a similar example. Score: 1 / 1 Question 4 (1 point) Find the composition in atom percent (at%) of the nickel in an alloy that consists of 41.81 wt% copper. Use decimal notation, digits after decimal: 2 Student response: 60.11 at% Correct answer: 60.10 at% General feedback: For help on composition conversions, please see page 71 of the textbook. An example similar to this question is given on page 73. Score:
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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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MTLS 1M03 - View Results Assignment 2(Ch 4 5 Name SOROUSH AKBARZADEH Started 4:47pm Attempt 1 3 Finished February 1 2009 2:44pm Out of 18 Time

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