# fnt9 - DL 9 FNTs 4 Look at a plot of the atom-atom...

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DL 9 FNTs 4) Look at a plot of the atom-atom potential. If the two atoms are momentarily at rest with a center to center separation of 1.4 sigma, what is the total energy of the system? If the sytem is at rest, it means one of three things. It could mean that this system isn't moving at all, that it is sitting at equilibrium, at rest. Since we're saying its at rest at 1.4 sigma, this isn't the case. The other two cases are when two masses are moving relative to one another. One case is when the bond between the atoms is compressed, and the atoms are momentarily at rest before moving away from each other. This occurs at values of r less than the equilibrium length, less than 1.12 sigma, so we know that's not the case. The third case is when two atoms are as far apart as they can get before they're pulled back together by their bond, when PE is equal to total E, and KE is zero. This occurs at some r max greater than 1.12 sigma. This must be the case! The total energy doesn't change, because this is a closed system, and

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## This note was uploaded on 07/31/2008 for the course PHY 7A taught by Professor Pardini during the Winter '08 term at UC Davis.

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fnt9 - DL 9 FNTs 4 Look at a plot of the atom-atom...

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