Question

The $p-V$ plots for two gases during adiabatic process as shown in figure plots $1$ and $2$ should correspond respectively to.

• A. $He$ and $O_2$
• B. $O_2$ and $He$
• C. $He$ and $Ar$
• D. $O_2$ and $N_2$

Answer 1

Answer: (B)

$O_2$ and $He$

Slope of adiabatic process of p-V diagram
$\left(\frac{dp}{dv}\right)=\gamma \frac{p}{V}$ i.e., slope $\alpha \gamma$
From graph$(slope{)}_2>(slope{)}_2$
$\Rightarrow {\gamma }_2>{\gamma }_1$
$\gamma$ for monoatomic gas (Ar, He) is greater than $\gamma$ for diatomic gas $(O_2,N_2)$.