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

p-V plots for two gases during adiabatic processes are shown in the fi

1.	p-V plots for two gases during adiabatic processes are shown in the figure. Plots 1 and 2 should correspond respectively to
Answer» (a) `H_e` and `O_2` (b) `O_2` and `H_e` (c) `H_e` and `A_r` (d) `O_2` and `N_2` Solution :In ADIABATIC process: slope of p-V GRAPH, `(dp)/(DV)=-gammap/V` `slope prop gamma` (with negative SIGN) From the GIVEN graph, `(slope)_2 gt (slope)_1` `:.` `gamma_2 gt gamma_1` Therefore, 1 should correspond to `O_2(gamma=1.4)` and 2 should correspond to `H_e(gamma=1.67)`. Hence, the correct option is (b).