# Question

In an ultra-high-vacuum system, the pressure is measured to be 1.00 X 10-10 torr (where 1 torr = 133 Pa). Assuming the molecular diameter is 3.00 % 10-10 m, the average molecular speed is 500 m/s, and the temperature is 300 K, find

(a) The number of molecules in a volume of 1.00 m3,

(b) The mean free path of the molecules, and

(c) The collision frequency.

(a) The number of molecules in a volume of 1.00 m3,

(b) The mean free path of the molecules, and

(c) The collision frequency.

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