First slide
Equilibrium
Question

The potential energy of diatomic molecule is given by U=Ar12-Br6 where, r is the distance between the atoms that make up the molecule and A and B are positive constants. Find the equilibrium separation between the atoms.

Moderate
Solution

The interaction force between the atoms is given by 
F=-dUds=--12As13+6Bs7
At equilibrium F=0, therefore s=2AB1/6

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