where $R$ is the molar gas constant.
(Take $\gamma$ for nitrogen and $CO_2$ as $1.4$ and $1.3$ respectively)
Statement $(I)$ : The mean free path of gas molecules is inversely proportional to square of molecular diameter.
Statement $(II)$ : Average kinetic energy of gas molecules is directly proportional to absolute temperature of gas.
In the light of the above statements, choose the correct answer from the option given below: