The mean free path and the average speed of oxygen molecules at $300 \ K$ and $1 \ atm$ are $3 \times 10^{-7} \ m$ and $600 \ m/s$,respectively. Find the frequency of its collisions.
- A$2 \times 10^{10} / s$
- B$9 \times 10^5 / s$
- C$2 \times 10^9 / s$
- D$5 \times 10^8 / s$
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