During an adiabatic process, if the pressure of a gas is found to be proportional to the cube of its absolute temperature, then the ratio of \(\rm \frac{C_p}{C_V}\) for the gas is :
1
\(\frac{5}{3}\)
2
\(\frac{9}{7}\)
3
\(\frac{3}{2}\)
4
\(\frac{7}{5}\)
5
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