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Q1. 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 percent10-10 m, the average molecular speed is 500 m/s, and temperature is 300 K, find

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

(b) The mean free path of molecules, and

Q2. An engineer is designing a pacemaker for cardiac patients. For the 20 year old woman, how many times must device have to beat for her to have a normal life expectancy?

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