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

Options

A. `He and O_2`
B. `O_2 and He`
C. `He and Ar`
D. `O_2 and N_2`

Answer

B

Explanation

(b) For adiabatic process `Pvgamma=constant`
Also for monoatomic gas `gamma=(C_P)/(C_V)=1.67`
for diatomic gas `gamma=1.4`

Since, `gamma_(diatomic)ltgamma_(mono atomic)`
`P_(diatomic)ltP_(mono atomic)`
`rArr` Graph 1 is for diatomic and graph 2 is for mono
atomic.