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STD 11 - 10.1, thermonetry,thermal expansion and calorimetry — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 10.1, thermonetry,thermal expansion and calorimetry4 Marks
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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