Physics - Heat & Thermo Question with Solution | TestHub

Three samples of the same gas $A$, $B$ and $C$ ($\gamma =\frac{3}{2}$) have initially equal volume. The volume of each sample is doubled. The process is adiabatic for $A$, isobaric for $B$ and isothermal for $C$. If the final pressures are equal for all three samples, the ratio of their initial pressures is: