A) \[{{r}^{3}}\]
B) \[{{r}^{2}}\]
C) r
D) 4 r
Correct Answer: B
Solution :
| Mean free path \[l=\frac{1}{n\pi {{r}^{2}}}\] |
| \[l\propto \frac{1}{{{r}^{2}}}\] |
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