Consider an ideal gas confined in an isolated closed chamber. As the gas undergoes an adiabatic expansion, the average time of collision between molecules increases as $V ^q$, where $V$ is the volume of the gas. The value of $q$ is $\left( {\gamma = \frac{{{C_P}}}{{{C_V}}}} \right)$
JEE MAIN 2015, Diffcult
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