05_01_31 - 15 Further evidence for photons The...

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[email protected] 15 Further evidence for photons ) ( 0 max ν ν - = h K 01/31/2005 The photoelectric effect: 1) The maximum electron energy depends only on 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
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[email protected] 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. Highest frequency is linear in electron energy. Typical electron energies are keV, and the work function of a few eV can therefore be neglected.
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