Question ID - 59307 | SaraNextGen Top Answer
Solids expand on heating because
a)
Kinetic energy of the atoms increases
b)
Potential energy of the atoms increases
c)
Total energy of the atoms increases
d)
The potential energy curve is asymmetric about the equilibrium distance between neighbouring atoms
Solids expand on heating because
a)
Kinetic energy of the atoms increases
b)
Potential energy of the atoms increases
c)
Total energy of the atoms increases
d)
The potential energy curve is asymmetric about the equilibrium distance between neighbouring atoms
(d)
The expansion of solids can be well understood by potential energy curve for two adjacent atoms in a crystalline solid as a function of their intermolecular separation 
.png)
At ordinary temperature: Each molecule of the solid vibrates about it’s equilibrium position 
between 
and 
(
is the equilibrium distance of it from some other molecule)
At high temperature: Amplitude of vibration increases 
Due to asymmetry of the curve, the equilibrium positions 
of molecule is displaced. Hence it’s distance from other molecules increses 
Thus, on raising the temperature, the average equilibrium between the molecules increases and the solid as a whole expands
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