Lecture09_QM1

Lecture09_QM1 - Quantum Theory Quantum 1 1 Topics q Discovery of the Electron Millikans Experiment Blackbody Radiation An Act of Desperation

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1 Quantum Theory Quantum Theory 1 1
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2 Topics Topics Discovery of the Electron Millikan’s Experiment Blackbody Radiation An Act of Desperation Summary
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3 The Discovery of the Electron The Discovery of the Electron 1838 – M. Faraday Discovery of arc light in dilute gas 1857 – H. Geissler Discovery of fluorescence in dilute gas 1880s – W. Crookes Development of cathode ray tube 1895 – J. Perrin Cathode rays found to be negatively charged
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4 The Discovery of the Electron The Discovery of the Electron 1896 – P. Zeeman First evidence of atomic particles with a specific charge-to-mass ratio 1897 – J.J. Thomson Measurement of charge-to-mass ratio of cathode ray particles. In effect, this was the discovery of the electron and the dawn of modern physics, in particular, particle physics (also known as high energy physics)
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5 The Discovery of the Electron The Discovery of the Electron C cathode A,B slits D,E deflection plates , / M E F quB F qE u E B = = = q u m RB =
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6 The Discovery of the Electron The Discovery of the Electron C cathode A,B slits D,E deflection plates , / M E F quB F qE u E B = = = Thomson found that whatever gas was used he always got the same q / m ratio of about 0.7 x 10 11 C/Kg . The cathode particles were called corpuscles by Thomson and later electrons by Lorentz
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7 Millikan’s Experiment Millikan’s Experiment Millikan began experiments in 1909 He measured e to be e = 1.601 x 10 -19 C Charged oil drops Suspended oil drops
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Blackbody Radiation Blackbody Radiation Josef Stefan 1835 – 1893 In 1879, Josef Stefan found an empirical formula to describe the power radiated by an ideal black body P = σ
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This note was uploaded on 02/17/2010 for the course PHY PHY3101 taught by Professor Prosper during the Spring '10 term at FSU.

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Lecture09_QM1 - Quantum Theory Quantum 1 1 Topics q Discovery of the Electron Millikans Experiment Blackbody Radiation An Act of Desperation

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