10-5-11 - Chemistry 1A F11 10.5.11 Dr. Shaka The...

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64 Chemistry 1A F11 10.5.11 Dr. Shaka Course Code 40000 The Photoelectric Effect • Newton had a “corpuscular” theory of light, in which he thought light was composed of particles, like small bullets. • He had problems explaining diffraction, however, and the wave theory of Huygens was accepted as correct. • According to the wave theory, it would take time for the oscillating electric field of the light wave to eject an electron. This is much like pushing a swing.
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65 Chemistry 1A F11 10.5.11 Dr. Shaka Course Code 40000 The Photoelectric Effect • Also, the number of photoelectrons should depend on the amplitude of the wave, but not the frequency of the wave.
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66 Chemistry 1A F11 10.5.11 Dr. Shaka Course Code 40000 The Photoelectric Effect • Instead, below a certain threshold frequency, there were no photoelectrons at all!
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67 Chemistry 1A F11 10.5.11 Dr. Shaka Course Code 40000 Max Planck’s Idea • Max Planck realized that there was a minimum amount of light, a quantum, and that the energy was proportional to the frequency of the light. Newton was right!
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This note was uploaded on 12/12/2011 for the course CHEM 1A taught by Professor Tobias during the Fall '01 term at UC Irvine.

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10-5-11 - Chemistry 1A F11 10.5.11 Dr. Shaka The...

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