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Binding Energy

The figure in...

Question

The figure indicates the potential energy curve of a diatomic molecule. What will be the value of binding energy?

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Solution

$\frac{d P . E}{d R} =$ Force on molecule
$\frac{d P . E}{d R} = 0$ at $R = 2 ˚ A$
$F = 0$
So the atom is in equilibrium at $R = 2 ˚ A$
$E$ at $r = 2 = - 8 J$
Binding energy to break the atoms= $8 J$

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