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The potential energy U of diatomic molec...

The potential energy U of diatomic molecules as a function of separation `r` is shown in figure. Identify the correct stateement.

A

The atoms are in equilibrium if `r = OA`

B

The force is repulsive only if `r` lies between A and B

C

The force is attractive if `r` lies between A and B

D

The atoms are in equilibrium if `r =OB`

Text Solution

Verified by Experts

The correct Answer is:
D
`F = - (dU)/(dr)` = - slope of U - r graph
At B, `"slope" = 0 `
`:. F = 0`
Hence , atoms are in equilibrium at B. From A to B or even before A slope is negative . Hence , force is positive force mean repulsion.
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