Thermal expansion of a solid is due to the - Vidyadip

MCQ

Thermal expansion of a solid is due to the

A
symmetric characteristic of the inter atomic potential energy curve of the solid
✓
asymmetric characteristic of the inter atomic potential energy curve of the solid
C
double well nature of the inter atomic potential energy curve of the solid
D
rotational motion of the atoms of the solid

✓

Answer

Correct option: B.

asymmetric characteristic of the inter atomic potential energy curve of the solid

b
$(b)$ An approximate potential energy curve for two particles is as shown below.

Here $E_1, E_2$ and $E_3$ are the total energy values of particles. As temperature increases, total energy $E$ increases.

Hence, mean separation $r$ also increases.

Note 'That mean separation $r$ is mid point of length of $E$ intercepted by potential energy curve.

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