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# During an adiabatic process, the pressure of a gas is proportional to the cube of its temperature. The value of $C_p/C_v$ for that gas is :

$\begin {array} {1 1} (a)\;\frac{7}{5} & \quad (b)\;\frac{4}{5} \\ (c)\;\frac{5}{3} & \quad (d)\;\frac{3}{2} \end {array}$

$(d)\;\frac{3}{2}$