Consider a hypothetical situation where we are comparing the properties of two crystals made of atom `A` and atom `B`. Potential energy `(U) v//s` interatomic separation (r) graph for atom `A` and atom `B` is shown in figure (i) and (ii) and respectively.

When we heat the crystal of either atoms ,the atom undergo oscillation. Choose correct statement for atoms of crystal `A`

Options

A. Their equilibrium position remains unchanged but average separation decreases
B. Their equilibrium position remains unchanged but average separation increases
C. Their separation at equilibrium position as well as average separation increases
D. Their separation at equilibrium position decreases but average separation increases

Answer

B

Explanation

The equilibrium remain unchanged but average distance increases.