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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

` (b ^(2))/(2a )`

B

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

C

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

D

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

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The correct Answer is:
C
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MOTION-HEAT-2 -EXERCISE-4 (LEVEL-I)
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  9. A Carnot engine, whose efficiency is 40%, takes in heat from a source ...

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  10. Helium gas goes through a cycle ABCDA (consisting of two isochoric and...

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  18. n' moles of an ideal gas undergoes a process AtoB as shown in the figu...

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