Collisions of slow moving electrons with nitrogen molecules . e relation just established. Then if p is thepressure 2 = N,P is the number of collisions an electron would make with the gas mole-cules if the pressure of the gas were one mm. The three pointsmarked P on Curve 14 were calculated from data at times abouttwo weeks apart, and serve as a check on the constancy of the system. C. Relation Between N and the Velocity of the electron stream which was used in these experiments containedelectrons with very different velocities. Curve 15 shows the per-centage of electrons
Collisions of slow moving electrons with nitrogen molecules . e relation just established. Then if p is thepressure 2 = N,P is the number of collisions an electron would make with the gas mole-cules if the pressure of the gas were one mm. The three pointsmarked P on Curve 14 were calculated from data at times abouttwo weeks apart, and serve as a check on the constancy of the system. C. Relation Between N and the Velocity of the electron stream which was used in these experiments containedelectrons with very different velocities. Curve 15 shows the per-centage of electrons which had a given velocity when the acceleratingpotential difference was 6 volts. It will be seen that the maximumpoint on the curve is at volts whereas, it should be at 6 voltsif the electrons leave the hot metal with zero velocity. The differ-ence, volts, represents the velocity of most of the electrons asthey are emitted fro,/; the hot platinum plate. Only 21 percent of theelectrons had t&e velocity which they would have acquired if they had. U. OF 1. S. S. FO«*M 3 r
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