If the potential energy between two molecules is given by U=−Ar6+Br12, then at equilibrium, separation between molecules, and the potential energy are :

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BA16, 0

B2A16, −A22B

2BA16, −A22B

2BA16, −A24B

answer is D.

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Detailed Solution

U=−Ar6+Br12 For equilibrium, net force should be zero.⇒F=-dUdr=0⇒6Ar7=12Br13∴r=2BA16 and U=−A24B