Download An Introduction To Quantum Physics by Anthony Philip French Edwin F.Taylor PDF

By Anthony Philip French Edwin F.Taylor

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The Franck-Hertz Experiment 21 In this experiment (see Figure 1-1 la), electrons from a hot C were accelerated through mercury vapor at low pressure toward a grid G. Those electrons that passed through cathode A if they had enough energy to overcome a small retarding potential. The accelerating voltage V between cathode and grid was continuously adjustable. 9 V. 9eV James Franck and Gustav Hertz, Verh. Dtsch. Phys. Ges. , 1961). Franck points out that when he and Hertz did the original experiment they had not even heard of the Bohr theory!

22 Simple models of the atom Not only is the pho- ton a quantum of radiant energy £, sponding amount of linear also carries a corre- it momentum p\ collisions between photons and electrons (or photons and other particles) can be analyzed using the energy and momentum conservation laws of (relativistic) particle dynamics. All observations on such p = E/c for an same relation be- collision events are consistent with the relation individual photon of any energy. This is the tween momentum and energy that holds classically for elec- tromagnetic radiation.

On the other hand, according to the photon hypothesis, the radiant energy arrives as individual quanta, randomly distributed, and there is some chance that the very first liberate a photoelectron. Lawrence and Beams showed ture: photon to arrive will Experiment confirms the photon in pic- 1928 that photoelec- x 10~ 9 sec after initial light beam so weak that the the wave picture would be trons are sometimes emitted less than 3 illumination, even with an incident expected time delay according to much longer.

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