The mean free path and the average speed of oxygen molecules at 300 K and 1 atm are 3 10-7 m and 600 m/s, respectively. Find the frequency of its collisions.
(4) 2 109/s
Between two collisions a molecule travels on average one mean free path at average speed v.
Collision frequency f = v
f = 6003 10-7 = 2 109 s-1
Answer: (4)
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