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Potential energy as a function of r is given by 5 10 r B r A U − = , where r is the interatomic distance, A and B are positive constants. The equilibrium distance between the two atoms will be:

1. 5 1 B A ⎟ ⎠ ⎞ ⎜ ⎝ ⎛
2. 5 1 A B ⎟ ⎠ ⎞ ⎜ ⎝ ⎛
3. 5 1 B A 2 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛
4. 5 1 A 2 B ⎟ ⎠ ⎞ ⎜ ⎝ ⎛

Correct answer: 5 1 B A 2 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛

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