MATSE 201 Exam 1 Theoretical Questions With 100% Correct Answers
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Course
MATSE 259
Institution
MATSE 259
MATSE 201 Exam 1 Theoretical Questions With 100% Correct Answers
What is true regarding the crystal systems?
there are 7 shapes that can completely fill 3D space through translational symmetry
Which of the following is not one of the crystal systems?
Face centered cubic
examples of cryst...
MATSE 201 Exam 1 Theoretical Questions
With 100% Correct Answers
What is true regarding the crystal systems?
there are 7 shapes that can completely fill 3D space through translational symmetry
Which of the following is not one of the crystal systems?
Face centered cubic
examples of crystal systems: tetragonal, rhombohedral, trigonal
Elemental metals do not commonly crystallize in which of the following lattices
Simple cubic
Which direction has the highest linear density in a crystal of Cu that crystallizes in the FCC?
[110]
Which direction has the highest linear density in a crystal of Na that crystallizes in BCC?
[111]
In a BCC metal, the plane with the highest planar density is:
(110)
The closest packed plane in a metal FCC structure is:
(111)
Which is true about Bragg's Law?
All statements listed are true...
1. It defines conditions necessary for diffraction in primitive cells
2. It is insufficient to predict diffraction in non-primitive cells
3. It relates the path length difference between to diffracted beams to the lattice d-spacing
Which plane will show a peak on a diffraction pattern for alpha -Fe (metal bcc structure)?
(220)
Which of the following statements about vacancies is true?
as temperature increases, the number of vacancies will increase
The Hume-Rothery rules give the conditions to be met for
Complete solid solubility
Which of the following describes the defect represented by Al-mg?
Aluminum substitution on a magnesium site
, Which of the following could be used to maintain electroneutrality for the substitution of an
aluminum atom into a a magnesium lattice point?
For every two aluminum substitutions, create a copper vacancy
Which is true regarding dislocations in crystals?
they can be described quantitatively by their Burger's vector
Twin boundaries, grain boundaries, and stacking faults all represent which kind of defect.
Two dimensional defects
Which of the following statements describes Fick's first law?
the diffusivity is proportional to the concentration gradient
Diffusion in a solid...
All statements are correct...
1. is facilitated by point defects such as vacancies
2. is a function of temperature
3. requires a concentration gradient
A condition of non-steady state diffusion (i.e. the net flux varying with time) can be described by..
Fick's Second Law
Diffusivity has units of
length^2/time
Which of the following statements about diffusion is true?
As bond energy increases, the activation energy for diffusion increases
NaCl crystallizes in the Rocksalt structure illustrated above. (the figure shows multiple unit cells
together).
Its x-ray diffraction pattern for lamda = 0.154 nm is also shown.
Consider NaCl as well as the compounds MgO, MgS, and Kbr which also crystal in the same structure.
Which shows the ranking order these compounds from lowest to highest melting point?
NaCl<KBr<MgS<MgO
Using a MgCl2 crystal as an example, if the compound was MgBr2, how would you expecte the curve
to change in a plot of ln as a function of 1/T.
Slope of the curve would decrease
What are the 7 crystal systems?
1. Cubic
2. Trigonal
3. Tetragonal
4. Triclinc
5. Monoclinic
6. Orthorhombic
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