A monatomic ideal gas undergoes a process in which the ratio of $\mathrm{P}$ to $\mathrm{V}$ at any instant is constant and equals to $1$. What is the molar heat capacity of the gas?
A$\frac{4 \mathrm{R}}{2}$
B$\frac{3 R}{2}$
C$5 R / 2$
D$0$
IIT 2006, Medium
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A$\frac{4 \mathrm{R}}{2}$
a
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