The poisson’s ratio for $O_2$ is 1.4. Which are correct for $O_2$ ?

$\frac{C_p}{C_v}=1.4=\gamma$

$C_p-C_v=R$

$\therefore \gamma C_v-C_v=R$

$\therefore C_v=\frac{R}{\gamma -1}$ and similarly $C_p-\frac{C_p}{\gamma }=R$

$\therefore C_v=\frac{2}{0.4}=5cal, \therefore C_p\frac{\gamma .R}{(\gamma -1)}$

Also $C_v=\frac{2}{0.4\times 32}=0.156cal$