Lecture23 3-7-08 Photoelectric Effect

Lecture23 3-7-08 Photoelectric Effect - Daylight Savings...

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Daylight Savings Time Starts Sunday Spring Forward
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Planck’s Blackbody Radiation Law Fits Experimental Data Planck’s constant, h, determined from best fit of the law to experimental curve h = 6.626 x 10 -34 J•s
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hv 2 hv 3 hv 4 hv E = hv Planck’s Blackbody Radiation Law Requires Quantization of Energy Levels of Blackbody Oscillators
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PHOTOELECTRIC EFFECT When UV light is shone on a metal plate in a vacuum, it emits charged particles (Hertz 1887), which were later shown to be electrons by J.J. Thomson (1899). Hertz J.J. Thomson I Vacuum chamber Metal plate Collecting plate Ammeter Potentiostat Light, frequency ν
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Where Would Albert Einstein Go to Ride a Bicycle? Santa Barbara California 1933!
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e - e - e - e - Einstein Photoelectric Effect Ann. Phys. Leipzig 1905 , 17 , 132-148 Nobel Prize in Physics, 1921
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e - e - e - Einstein Photoelectric Effect E hv = E binding + E kinetic hv e -
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A Photocell is Used to Study the Photoelectric Effect
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Influence of Light Intensity on the Photoelectric Effect Intensity has no effect below threshold frequency
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Where Does Quantum Theory of Light Come From? Classically, for light as a wave, its energy is proportional to the square
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This note was uploaded on 08/06/2008 for the course CHEM 1B taught by Professor Watts during the Winter '08 term at UCSB.

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Lecture23 3-7-08 Photoelectric Effect - Daylight Savings...

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