What will be the average value of energy along one degree of freedom for an ideal gas in thermal equilibrium at a temperature $T \,?\left( k _{ B }\right.$ is Boltzmann constant)
A$\frac{1}{2} k _{ B } T$
B$\frac{2}{3} k _{ B } T$
C$\frac{3}{2} k _{ B } T$
D$k _{ B } T$
JEE MAIN 2021, Medium
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A$\frac{1}{2} k _{ B } T$
a Energy associated with each degree of freedom per $=\frac{1}{2} k _{ B } T$
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