In a certain gas the molecules are 5.0 × 10?9 m apart on average, have a mean free path of 5.0×10?6 m, and have an average speed of 500 m/s. The rate at which a molecule has collisions with other molecules is about:
A. 10?11 s?1
B. 10?8 s?1
C. 1 s?1
D. 10^8 s?1
E. 10^11 s?1
Answer: D. 10^8 s?1
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