MAT E 273 Exam Questions and Correct Answers (100%
COMPLETE ANSWERS) ALREADY GRADED A+ | 100%
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body diagonal family - ANSWER-<1 1 1>
Low symmetry systems have _____________ equivalent directions - ANSWER-fewer
Naming Planes - ANSWER-1. select origin not in plane
2. write fractional intersection plane makes with coordinate axis
3. take reciprocal of intersections
4. enclose indices in parenthesis (h k l)
cube faces family - ANSWER-{1 0 0}
cube diagonal plane family - ANSWER-{1 1 0}
cube body diagonal family (triangles) - ANSWER-{1 1 1}
How to tell perpendicularity - ANSWER-plane (h k l) is perpendicular to direction [h k l]
Which element adopts SC at STP - ANSWER-Polonium (Po)
Which of the cubic structures indicate ductile alloys and metals - ANSWER-BCC and FCC
How many atoms per unit cell for each cubic? - ANSWER-SC 1
BCC 2
FCC 4
DC 8
, Coordination number for each cubic - ANSWER-SC 6
BCC 8
FCC 12
DC 4
Lattice parameter equations for each cubic - ANSWER-SC a = 2R
BCC a*sqrt(3) = 4R
FCC a*sqrt(2) = 4R
What is APF of FCC? - ANSWER-0.74
vacancy - ANSWER-missing atom in the host material, usually generated from thermal fluctuations
(causes local strain)
substitutional impurity - ANSWER-positioned on lattice site of host material
interstitial impurity - ANSWER-within empty space of host crystal
self-interstitial - ANSWER-host atom is out of alignment and centered over interstitial site (causes local
compression)
edge dislocation - ANSWER-missing a portion of plane of atoms
The mobility of these dictate mechanical properties of most metals. - ANSWER-dislocations
If dislocation moves easily - ANSWER-the metal is ductile
If dislocation is difficult to move - ANSWER-the metal is hard/brittle
COMPLETE ANSWERS) ALREADY GRADED A+ | 100%
satisfaction guaranteed
body diagonal family - ANSWER-<1 1 1>
Low symmetry systems have _____________ equivalent directions - ANSWER-fewer
Naming Planes - ANSWER-1. select origin not in plane
2. write fractional intersection plane makes with coordinate axis
3. take reciprocal of intersections
4. enclose indices in parenthesis (h k l)
cube faces family - ANSWER-{1 0 0}
cube diagonal plane family - ANSWER-{1 1 0}
cube body diagonal family (triangles) - ANSWER-{1 1 1}
How to tell perpendicularity - ANSWER-plane (h k l) is perpendicular to direction [h k l]
Which element adopts SC at STP - ANSWER-Polonium (Po)
Which of the cubic structures indicate ductile alloys and metals - ANSWER-BCC and FCC
How many atoms per unit cell for each cubic? - ANSWER-SC 1
BCC 2
FCC 4
DC 8
, Coordination number for each cubic - ANSWER-SC 6
BCC 8
FCC 12
DC 4
Lattice parameter equations for each cubic - ANSWER-SC a = 2R
BCC a*sqrt(3) = 4R
FCC a*sqrt(2) = 4R
What is APF of FCC? - ANSWER-0.74
vacancy - ANSWER-missing atom in the host material, usually generated from thermal fluctuations
(causes local strain)
substitutional impurity - ANSWER-positioned on lattice site of host material
interstitial impurity - ANSWER-within empty space of host crystal
self-interstitial - ANSWER-host atom is out of alignment and centered over interstitial site (causes local
compression)
edge dislocation - ANSWER-missing a portion of plane of atoms
The mobility of these dictate mechanical properties of most metals. - ANSWER-dislocations
If dislocation moves easily - ANSWER-the metal is ductile
If dislocation is difficult to move - ANSWER-the metal is hard/brittle
