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Q.
According to equipartition law of energy each particle in a system of particles have thermal energy $E$ equal to
Kinetic Theory
Solution:
According to equipartition of energy, each particle have thermal energy $E$ equal to, $E =\frac{ f }{2} KT \quad[ f =$ degrees of freedom $]$
Here, $f=3$
$
\therefore E =\frac{3}{2} KT
$