The relation between the gas pressure $P$ and average kinetic energy per unit volume $E$ is
A$P = \frac{1}{2}E$
B$P = E$
C$P = \frac{3}{2}E$
D$P = \frac{2}{3}E$
AIPMT 1991, Diffcult
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D$P = \frac{2}{3}E$
d $P = \frac{2}{3}E$
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