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ENSC 3313, Fal12001
TEST 1
Name
...=nswer
alll O questions~ 2 points each.
I.
The element Cf54 is sold by the Atomic Energy Commission for $1 a/microgram ( one millionth of a
gram) and has a halfIife of 55 days. Please consider a onemilligram sample. If the sample is prepared
and shipped via over night delivery, what is the value of the material that decays during the 24 hours of
shipping?
1
t
A
55
A
In {0.5)=
=> .A. = 79.35 day
A = (1000
J.lg)ems
= 987.5
J.lg
$10
(1000
987.5)
J.lg x =
$125
J.lg
=
2
Wavelengths shorter than 225 nanometers are strongly absorbed by the valence electrons of diamond's
carbon atoms, which then move to the conduction band and can produce a "response" signal. What band
gap, E, (energy change 1lE) does this correspond to? Answer in electron volts please. Know that
Planck's constant, h = 0.662 x 1033
I.s, and leV = 0.160 x 1018 I. The velocity of light = 0.299 x 109
mls.
~=~
I..
Substituting
AB =
= 5.5 eV
3
What is the coordination number for cesium cWoride? ~
that the radius ratio 0.732 is significant.
There are 8 equivalent nearest neighbors. This is the
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 Fall '11
 staff
 Atomic Energy Commission, edge dislocation, residual stresses, fold symmetry axes, equivalent nearest neighbors

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