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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 BC. The force is attractive if `r` lies between A and BD. The atoms are in equilibrium if `r =OB` |
Answer» Correct Answer - 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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