JEE PHYSICS MCQ: ATOMS

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Application +4 | -1

Potential energy as a function of

r

is given by

U = \frac{A}{{{r^{10}}}} - \frac{B}{{{r^5}}},

where

r

is the interatomic distance, A and B are positive constants. The equilibrium distance between the two atoms will be:

View answer and explanation

Correct option: C

{\left( {\frac{{2A}}{B}} \right)^{\frac{1}{5}}}

Option C (

{\left( {\frac{{2A}}{B}} \right)^{\frac{1}{5}}}

) is correct because at equilibrium, the derivative of the potential energy with respect to r is zero, which leads to this expression for r.

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