7AC/D Win 09
Quiz 4
DL Sec
Last 6 digits ID #
Name (Last, First)
Grade
1) The potential energy between two particles as a
function of separation is graphed to the right.
Starting from a temperature of zero Kelvin, we
add a total of 10 x 10
21
J energy.
Describe the
behavior of the system after we wait some
time. Include an explanation as to whether the
two atoms are bound or not .
Ignore
interactions with any other particles.
At absolute zero, KE = E
th
= 0.
So total energy
is just bond energy, i.e. the PE at the bottom of the
well, 5 x 10
21
J.
Adding 10 units of energy brings
us to E
tot
= +5 x 10
21
J.
This is enough energy so
that out at large separations, where PE =0, we still can
have a positive KE.
This means that after we wait a
while, the particles are unbound and are likely to have some
positive KE while an arbitrary distance apart from each other
(think of two particles in an ideal gas).
2) This time, we give the two particles a fixed total energy of 4 x 10
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 Winter '09
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 Energy, #, KE, 1.12 nm

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