The mean free path for a gas, with molecular diameter \(d\) and number density \(n,\) can be expressed as:
| 1. | \( \dfrac{1}{\sqrt{2} n \pi {d}^2} \) | 2. | \( \dfrac{1}{\sqrt{2} n^2 \pi {d}^2} \) |
| 3. | \(\dfrac{1}{\sqrt{2} n^2 \pi^2 d^2} \) | 4. | \( \dfrac{1}{\sqrt{2} n \pi {d}}\) |
The mean free path of molecules of a gas (radius \(r\)) is inversely proportional to:
| 1. | \(r^3\) | 2. | \(r^2\) |
| 3. | \(r\) | 4. | \(\sqrt{r}\) |