10-28-10 - Lecture 10 - Chapter 7

10-28-10 - Lecture 10 - Chapter 7 - Electromagnetic...

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Electro Electro magnetic magnetic Spectrum Spectrum
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State of Science in 1900 State of Science in 1900 Light and other radiation described by Maxwell’s equations Motion of particles described by Newton’s equations Thought that most problems had been solved and understood Unsolved problems: blackbody radiation, photoelectric effect, line spectra of atoms and molecules Most scientists thought these would soon be solved and the universe understood.
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Black-body Radiation Credit: http://www.dkimages.com/discover/previews/923/4501
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Revolution in Science Revolution in Science 1900 - Planck explained blackbody radiation using quantized energy 1905 - Einstein explained photoelectric effect using quantized energy 1905 – Einstein published special theory of relativity 1913 – Bohr theory of the atom 1923 – deBroglie wave hypothesis 1925 - Schrödinger wave mechanics 1925 – Heisenberg matrix mechanics 1927 – electron diffraction confirms deBroglie
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= nh E = nh ν ν Quantization of Energy Quantization of Energy Energy of radiation is proportional to frequency h = Planck’s constant = 6.6260693 x 10 -34 J s An object can gain or lose energy by absorbing or emitting radiant energy in discrete amounts or QUANTA . Max Planck (1858-1947)
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This note was uploaded on 01/05/2011 for the course CHEM 6A taught by Professor Pomeroy during the Fall '08 term at UCSD.

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10-28-10 - Lecture 10 - Chapter 7 - Electromagnetic...

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