MAT E 202 Practice Test Questions with Verified
Correct Answers
What is S_0
The slope of the curve @ r_0
What is R_0
When the curve is at eq ie crosses distance axis
What E0
The depth of the energy well on energy distance graph
Describe a Force distance graph
R0 at zero, S0 slope at r0 attraction points up on y axis and repulsion point down.
Describe a Energy distance graph
Where R0 occurs you get greatest depth and your E0 is the depth of the well. You get attraction
down and repulsion pointing upwards.
What is the thermal strain formula
deltaL1-delta l2 over l0
or
/DeltaT (alpha1-alpha2)
In crystal structures what is a
Length of Unit cell
, What is R in crystal structures
atomic radius
What is the coordination number
How many atoms does each atom touch
For simple Cubic how many atoms in the unit cell
1 atom
What is the APF
Atomic packing factor
Volume of atoms in a unit cell
--------------------------------
Total unit cell volume
What is the volume for atoms
4/3pi r^3
Explain what are closed packed planes
Its like the 2d layer of how the atoms are stacked in each crystal structure
What are the closed packed planes for FCC, BCC, HCP
FCC: ABC
BCC: No closed packed planes
HCP: ABAB
Correct Answers
What is S_0
The slope of the curve @ r_0
What is R_0
When the curve is at eq ie crosses distance axis
What E0
The depth of the energy well on energy distance graph
Describe a Force distance graph
R0 at zero, S0 slope at r0 attraction points up on y axis and repulsion point down.
Describe a Energy distance graph
Where R0 occurs you get greatest depth and your E0 is the depth of the well. You get attraction
down and repulsion pointing upwards.
What is the thermal strain formula
deltaL1-delta l2 over l0
or
/DeltaT (alpha1-alpha2)
In crystal structures what is a
Length of Unit cell
, What is R in crystal structures
atomic radius
What is the coordination number
How many atoms does each atom touch
For simple Cubic how many atoms in the unit cell
1 atom
What is the APF
Atomic packing factor
Volume of atoms in a unit cell
--------------------------------
Total unit cell volume
What is the volume for atoms
4/3pi r^3
Explain what are closed packed planes
Its like the 2d layer of how the atoms are stacked in each crystal structure
What are the closed packed planes for FCC, BCC, HCP
FCC: ABC
BCC: No closed packed planes
HCP: ABAB
