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49. (11) We saw in Example 18-8 that the mean free path &M of air molecules at STP is about 9 x 108 m. Estimate the collision frequency f, the number of collisions per unit time.

49. (II) We saw in Example 18-8 that the
mean free path &M of air molecules at STP
is about 9 x 10-8 m. Estimate the collision
frequency f, the number of collisions per unit
time.

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