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Question: P – V plots for two gases during adiabatic processes are shown in the figure. Plots 1 and 2 should c...

P – V plots for two gases during adiabatic processes are shown in the figure. Plots 1 and 2 should correspond respectively to

A

He and O2

B

O2 and He

C

He and Ar

D

O2 and N2

Answer

O2 and He

Explanation

Solution

Slope of the curve =dPdV=γPV= \frac{dP}{dV} = - \gamma\frac{P}{V}.

As curve 2 is steeper, its γ is greater. Also, γ = 5/3 for monoatomic gas and γ = 7/5 for diatomic gas.

Hence (2) is the correct answer.