\(\mathrm{PT}^{-3}=\text { constant }\)
\(\because \frac{\mathrm{PV}}{\mathrm{T}}=\mathrm{nR}=\text { constant from ideal gas equation }\)
\((\mathrm{P})(\mathrm{PV})^{-3}=\text { constant }\)
\(\mathrm{P}^{-2} \mathrm{~V}^{-3}=\text { cosntant } \quad . .(1)\)
\(\because \text { Process equation for adiabatic process is }\)
\(\mathrm{PV}^y=\text { constant } \quad . .(2)\)
\(\text { Comparing equation (1) and (2) }\)
\(\frac{\mathrm{C}_{\mathrm{p}}}{\mathrm{C}_{\mathrm{V}}}=\mathrm{y}=\frac{3}{2}\)
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