EEE 352 TEST 1 EXAM QUESTIONS AND
ANSWERS 2026 VERIFIED.
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
How is this determined experimentally (in reference to metals being crystalline or amorphous)?
- ANS diffraction experiments
@2026/2027 ALLRIGHTS RESERVED.
, 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 - ANS an extrinsic property that DOES depend on size and shape.
Does the classical free electron gas model accurately predict the specific heat of a metal? -
ANS No, the classical theory predicts a specific heat for the electron gas that is ~100X larger
than the
experimental value at room temperature.
Which of the following are discrete
(quantized) for an electromagnetic wave in a cavity,
according to Max Planck? Amplitude, energy, frequency, wave vector. - ANS All of the above
Why is Δx Δp_x ≥ h(bar)/2 unimportant for a baseball? - ANS The Heisenberg uncertainty
principle is unimportant for a baseball because is a very small number.
h
A measurement of a baseball's position will introduce an absolutely negligible uncertainty in its
@2026/2027 ALLRIGHTS RESERVED.
ANSWERS 2026 VERIFIED.
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
How is this determined experimentally (in reference to metals being crystalline or amorphous)?
- ANS diffraction experiments
@2026/2027 ALLRIGHTS RESERVED.
, 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 - ANS an extrinsic property that DOES depend on size and shape.
Does the classical free electron gas model accurately predict the specific heat of a metal? -
ANS No, the classical theory predicts a specific heat for the electron gas that is ~100X larger
than the
experimental value at room temperature.
Which of the following are discrete
(quantized) for an electromagnetic wave in a cavity,
according to Max Planck? Amplitude, energy, frequency, wave vector. - ANS All of the above
Why is Δx Δp_x ≥ h(bar)/2 unimportant for a baseball? - ANS The Heisenberg uncertainty
principle is unimportant for a baseball because is a very small number.
h
A measurement of a baseball's position will introduce an absolutely negligible uncertainty in its
@2026/2027 ALLRIGHTS RESERVED.
