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

For adiabatic process slope of P – V graph at a point (P, V) =  γPVAt point A, (slope)1 < (slope)2∴        γ1   <    γ2 ⇒    1+2f1   <   1+  2f2     ⇒       f1  >    f2f1 and f2 are number of degrees of freedom.O2  has degree of freedom = 5.While He has degree of freedom = 3.