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Spring 2008
Prelim I
March 27, 2008
Problem 1:
a)
Identify the following plane. (5 points)
Consider two theoretical materials D and K, given the following properties:
D:
SC
ρ = 3.14 g/cm
3
,
M = 12.01 g/mol
K:
BCC
ρ = 4.56 g/cm
3
,
M = 10.81 g/mol
b)
Find the lattice parameter and atomic concentration. (10 points)
c) For the given two theoretical materials compare the (100) and (110) planar
concentrations of atoms and state which plane has a higher electrical conductivity for each
material and why.
(10 points)
Z
X
Y
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View Full DocumentProblem 2:
a)
What factors impact the signal transmission within a microchip and which of those
factors do material scientists work on these days. (5 points)
b)
Calculate the drift mobility and the mean scattering time of conduction electrons in Al
at room temperature, given that the resistivity of Al is
26.5 nΩ m
.
The density of aluminum is
2.7 g/cm
3
, its atomic mass is
26.982 g/mol
and valence is three. (10 points)
c)
What is the drift velocity if the applied electric field is
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 Spring '09
 MALLIARAS

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