EMA 3010 EXAM 2 LATEST EXAM
QUESTIONS AND CORRECT VERIFIED
ANSWERS
Q: Procedure for writing plan notation
Ans: 1. Shift coordinate system if plane passes through origin
2. Identify intersections along x,y,z axes. A plane parallel to axis
has infinity intercept, 0 index.
3. take reciprocal of intercepts
4. reduce to integers
5. enclose numbers in parentheses, using overscores for negative
numbers
Quiz: When written plane coordinates are enclosed by what?
Ans: Parentheses
Quiz: When writing plane coordinates how do you indicate a negative
index?
,Ans: An overscore over the number.
Quiz: Linear Packing Density (LD)
Ans: LD = (number of atoms centered on direction
vector)/(length of direction vector)
units are reciprocal length
Quiz: Planar Packing Density (PD)
Ans: PD = (number of atoms centered on plane)/(area of
plane)
units are reciprocal area
Quiz: Linear Density of Aluminum
Ans: 3.5 nm(^-1)
Quiz: Planar Density of (100) Iron
,Ans: 1.2E19 atoms/m^2
Quiz: Single Crystal
Ans: A crystalline solid that exhibits only one orientation of
arrangement
Properties vary with direction (anisotropic)
Quiz: Polycrystalline
Ans: Solids that exhibit more than one orientation
Properties may/may not vary with direction if grains are
randomly oriented (isotropic)
Quiz: Grains
Ans: Regions of similar orientation
Quiz: Grain Boundaries
, Ans: The amorphous structures that separate regions of
similar orientation.
Quiz: Isotropic
Ans: Material Properties are non-directional
Quiz: Anisotropic
Ans: Material Properties are directional
Quiz: X-Ray Diffraction (XRD)
Ans: Used to characterize crystal structure, based on Bragg's
law, which relates angles corresponding to constructive
interference to the interplane spacing (d).
Quiz: X-Rays to Determine Crystal Structure
QUESTIONS AND CORRECT VERIFIED
ANSWERS
Q: Procedure for writing plan notation
Ans: 1. Shift coordinate system if plane passes through origin
2. Identify intersections along x,y,z axes. A plane parallel to axis
has infinity intercept, 0 index.
3. take reciprocal of intercepts
4. reduce to integers
5. enclose numbers in parentheses, using overscores for negative
numbers
Quiz: When written plane coordinates are enclosed by what?
Ans: Parentheses
Quiz: When writing plane coordinates how do you indicate a negative
index?
,Ans: An overscore over the number.
Quiz: Linear Packing Density (LD)
Ans: LD = (number of atoms centered on direction
vector)/(length of direction vector)
units are reciprocal length
Quiz: Planar Packing Density (PD)
Ans: PD = (number of atoms centered on plane)/(area of
plane)
units are reciprocal area
Quiz: Linear Density of Aluminum
Ans: 3.5 nm(^-1)
Quiz: Planar Density of (100) Iron
,Ans: 1.2E19 atoms/m^2
Quiz: Single Crystal
Ans: A crystalline solid that exhibits only one orientation of
arrangement
Properties vary with direction (anisotropic)
Quiz: Polycrystalline
Ans: Solids that exhibit more than one orientation
Properties may/may not vary with direction if grains are
randomly oriented (isotropic)
Quiz: Grains
Ans: Regions of similar orientation
Quiz: Grain Boundaries
, Ans: The amorphous structures that separate regions of
similar orientation.
Quiz: Isotropic
Ans: Material Properties are non-directional
Quiz: Anisotropic
Ans: Material Properties are directional
Quiz: X-Ray Diffraction (XRD)
Ans: Used to characterize crystal structure, based on Bragg's
law, which relates angles corresponding to constructive
interference to the interplane spacing (d).
Quiz: X-Rays to Determine Crystal Structure
