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The potential energy function for the fo...

The potential energy function for the force between two atoms in a diatomic molecule is approximate given by `U(r) = (a)/(r^(12)) - (b)/(r^(6))`, where `a` and `b` are constants and `r` is the distance between the atoms. If the dissociation energy of the molecule is `D = [U (r = oo)- U_("at equilibrium")],D` is

A

`frac(b^2)(6a)`

B

`frac(b^2)(2a)`

C

`frac(b^2)(12a)`

D

`frac(b^2)(4a)`

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