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Question: a 10 cm b 61 a...

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10-11 A beam of electrons is projected from an electron gun into a gas at a pressure P, and the number remaining in the beam at a distance x from the gun is determined by allowing the beam to strike a collecting plate and measuring the current to the plate. The electron current emitted by the gun is 100 pA, and the current to the collector when x - 10 cm and P 100 N m-2 (about 1 Torr) is 37 μΑ. (a) what is the electron mean free path? (b) What current would be collected if the pressure were reduced to 50 Nm?
(a) 10 cm ; (b) 61 µA

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