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The interaction energy of London forces between two particles is proportional to r−x, where r is the distance between the particles. The value of x is : (1) 3 (2) −3 (3) −6 (4) 6

1. 3
2. −3
3. −6
4. 6

Correct answer: −3

Solution

London forces, which are a type of van der Waals force, arise from temporary dipoles in molecules and their strength decreases with distance. The interaction energy is inversely proportional to the sixth power of the distance between particles, leading to the relationship r^{-6}, which indicates that x is -6.

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