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10-08-07%20-%20Lecture%204%20-%20Chapter%201

10-08-07%20-%20Lecture%204%20-%20Chapter%201 -...

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Photoelectric Effect Photoelectric Effect Experiment demonstrates the particle nature of light.
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Photoelectric Effect Photoelectric Effect
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Photoelectric Photoelectric Effect Classical theory said that kinetic energy of ejected electron should increase with increase in light intensity—not observed! No e - observed until light of a certain minimum frequency (energy) is used. Velocity of ejected electrons increases with frequency A. Einstein (1879-1955) E = h ν
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Photoelectric Effect Photoelectric Effect We can understand all experimental observations if light consists of particles called PHOTONS – packets of discrete energy E = h ν
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Are Photons Particles or Waves? Are Photons Particles or Waves?
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Quantum or Wave Mechanics Quantum or Wave Mechanics de Broglie (1924) proposed that all moving objects have wave properties. For light: E = mc 2 E = h ν = hc / λ Therefore, mc = h / λ and for particles (mass)(velocity) = h / λ Louis de Broglie (1892-1987)
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Wave Particle Duality Wave Particle Duality Electrons (and other atomic entities) exhibit properties of both waves and particles.
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