Quiz4_sol - 7A-C/D Win 09 Quiz 4 DL Sec Last 6 digits ID #...

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7A-C/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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This note was uploaded on 09/13/2010 for the course PHY 7A 56192 taught by Professor ? during the Winter '09 term at UC Davis.

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