The number of air molecules per cm 3 is increased from 3 x 10 19 to 12 x 10 19 . The ratio of collision frequency of air molecules before and after the increase in number respectively is :
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The given data is
n 1 = 3 x 10 19
n 2 = 12 x 10 19
The mean time between two collision has the meaning of a period 
, since it indicates the repetitive time intervals in which on average collisions take place. The reciprocal of the time 
can be understood as the collision frequency f, which indicates the number of collisions per unit time. The collision frequency is also directly proportional to the number molecules per unit volume.
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