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Unformatted text preview: Georg.Hoffstaetter@Cornell.edu 15 Further evidence for photons ) ( max - = h K 01/31/2005 The photoelectric effect: 1) The maximum electron energy depends only on Q and increases linearly with Q : E max = h Q- W (Millikan 1916) 2) There is a minimum Q independent of intensity. It is the Work function W divided by h . 3) The first emission happens faster than a wave would deposit energy (Lawrence and Beams 1928) 4) Different metals lead to the same value for h e e e Q Q Q ! Georg.Hoffstaetter@Cornell.edu 16 Further evidence for photons 01/31/2005 The Compton effect: Scattering of light with free electrons follows the formulas of classical scattering of free particles when one assumes an energy E=h Q and momentum p=E/c=h/ O for the photons. (Compton 1919-1923) Bremsstrahlung The maximum emitted frequency depends only on the electron energy, not on the e-beam intensity....
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