Page |1
EEE 352 Test 1 Questions and Correct
Answers/ Latest Update / Already Graded
Long-range order
Ans: knowing the positions of atoms precisely in one region of
a solid allows
us to predict the exact positions of atoms elsewhere (far away).
Short-range order
Ans: we can
only make such predictions within a few atomic distances from
the known atoms; after that, too much
randomness creeps in to make reliable predictions.
Which types do amorphous and
crystalline solids have?
Ans: Crystalline solids have both types, polycrystalline
solids have both types within grains or crystallites, and
amorphous solids have only short-range order.
Are metals usually crystalline or amorphous?
Ans: crystalline
All rights reserved © 2025/ 2026 |
, Page |2
How is this determined experimentally (in reference to metals being
crystalline or amorphous)?
Ans: diffraction experiments
Name two techniques that can "image" atoms.
Ans: Two methods that can image atoms are scanning
tunneling microscopy (or variations such as atomic
force microscopy) and high resolution transmission electron
microscopy (HR-TEM).
Which is usually bigger, drift velocity or thermal velocity?
Ans: Thermal (random) velocity of electrons in a solid is usually
MUCH faster than the average velocity due
to an applied electric field, which we call drift velocity.
Resistivity
Ans: an intrinsic property of a material, which does not
normally depend on size or shape.
Resistance
All rights reserved © 2025/ 2026 |
EEE 352 Test 1 Questions and Correct
Answers/ Latest Update / Already Graded
Long-range order
Ans: knowing the positions of atoms precisely in one region of
a solid allows
us to predict the exact positions of atoms elsewhere (far away).
Short-range order
Ans: we can
only make such predictions within a few atomic distances from
the known atoms; after that, too much
randomness creeps in to make reliable predictions.
Which types do amorphous and
crystalline solids have?
Ans: Crystalline solids have both types, polycrystalline
solids have both types within grains or crystallites, and
amorphous solids have only short-range order.
Are metals usually crystalline or amorphous?
Ans: crystalline
All rights reserved © 2025/ 2026 |
, Page |2
How is this determined experimentally (in reference to metals being
crystalline or amorphous)?
Ans: diffraction experiments
Name two techniques that can "image" atoms.
Ans: Two methods that can image atoms are scanning
tunneling microscopy (or variations such as atomic
force microscopy) and high resolution transmission electron
microscopy (HR-TEM).
Which is usually bigger, drift velocity or thermal velocity?
Ans: Thermal (random) velocity of electrons in a solid is usually
MUCH faster than the average velocity due
to an applied electric field, which we call drift velocity.
Resistivity
Ans: an intrinsic property of a material, which does not
normally depend on size or shape.
Resistance
All rights reserved © 2025/ 2026 |
