Lecture26 - Early Quantum Theory Werner Heisenberg...

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Early Quantum Theory Max Planck (1858-1947) Erwin Schrödinger (1887-1961) Werner Heisenberg (1901-1976)
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Blackbody Radiation and Incandescence
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Planck’s Quantum Hypothesis Where the Planck constant h has a value: 34 15 6.63 10 J s 4.14 10 eV s h hf E min nhf E Where n = 1, 2, 3, …
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4 The energy of light with frequency f must be an integer multiple of hf . In the previous chapters we dealt with such large quantities of light, that individual photons were not distinguishable. Modern experiments can be performed with single photons. So what aspect of light is quantized? Frequency and wavelength still can be any value and are continuously variable, not quantized Photons 38- (photon energy) E c f However, given light of a particular frequency, the total energy of that radiation is quantized with an elementary amount (quantum) of energy E given by: Where the Planck constant h has a value: 34 15 6.63 10 J s 4.14 10 eV s h where c is the speed of light 3x10 8 m/s
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5 When short wavelength light illuminates a clean metal surface, electrons are ejected from the metal. These photoelectrons produce a photocurrent. First Photoelectric Experiment: Photoelectrons stopped by stopping voltage V stop . The kinetic energy of the most energetic photoelectrons is The Photoelectric Effect 38- Fig. 38-1 max stop K eV K max does not depend on the intensity of the light!
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Lecture26 - Early Quantum Theory Werner Heisenberg...

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