L10 - Nobel prizes Thomson Milllikan and Rutherford Closest approach Rutherford atom Niels Bohr Bohr model Bohr energy Does Bohr make sense

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Unformatted text preview: Nobel prizes Thomson, Milllikan, and Rutherford Closest approach Rutherford atom Niels Bohr Bohr model Bohr energy Does Bohr make sense? Experimental confirmation: hydrogen spectra Experimental confirmation: Moseley’s law Experimental confirmation: Franck-Hertz experiment Reduced mass Mysteries of Bohr’s atom Matter waves Davisson and Germer 2009 Nobel Prizes • Physics: discovery of fiber optics, and charge-coupled device electronic image detectors. Charles Kao (Standard Telecom Labs, UK), Willard Boyle (Bell Labs), George Smith (Bell Labs). • Chemistry: structure of the ribosome from protein crystallography. Venkatraman Ramakrishnan (formerly BNL Biology, now MRC Cambridge), Tom Steitz (Yale), Ada Yonath (Weizmann Institute). • Biology: telomere shortening and cell life. Elizabeth Blackburn (UC San Francisco), Carol Greider (Johns Hopkins), Jack Szostak (Harvard Medical School). Nobel prizes Thomson, Milllikan, and Rutherford Closest approach Rutherford atom Niels Bohr Bohr model Bohr energy Does Bohr make sense? Experimental confirmation: hydrogen spectra Experimental confirmation: Moseley’s law Experimental confirmation: Franck-Hertz experiment Reduced mass Mysteries of Bohr’s atom Matter waves Davisson and Germer The ribosome N. Ban, P. Nissen, J. Hansen, P. B. Moore, and T. A. Steitz, “The complete atomic structure of the large ribosomal subunit at 2.4 Å resolution,” Science 289 , 5481 (2000). 3 million Daltons (1 Dalton=1 amu=1/12 mass of 12 C atom), or more than 200,000 atoms. Protein synthesis machine; a triumph of modern crystallography. Nobel prizes Thomson, Milllikan, and Rutherford Closest approach Rutherford atom Niels Bohr Bohr model Bohr energy Does Bohr make sense? Experimental confirmation: hydrogen spectra Experimental confirmation: Moseley’s law Experimental confirmation: Franck-Hertz experiment Reduced mass Mysteries of Bohr’s atom Matter waves Davisson and Germer Thomson and Millikan • We learned of J.J. Thomson and the discovery of the electron: cathode rays are made of particles with a constant ratio q / m (1897). • There was already some evidence of a discrete charge value q , which was finally proven conclusively by Millikan in 1909. • From Einstein’s E = mc 2 and the energy of electrostatic charge densities, we arrive at a “classical” radius of the electron of r e = 2 . 82 × 10- 15 m. • Atoms are much bigger: ∼ 2 × 10- 10 m. • Thomson’s plum pudding: matter is electrostatically neutral, with electrons as little negative bits (the raisins in the pudding). Nobel prizes Thomson, Milllikan, and Rutherford Closest approach Rutherford atom Niels Bohr Bohr model Bohr energy Does Bohr make sense?...
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This note was uploaded on 05/28/2011 for the course PHY 251 taught by Professor Rijssenbeek during the Fall '01 term at SUNY Stony Brook.

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L10 - Nobel prizes Thomson Milllikan and Rutherford Closest approach Rutherford atom Niels Bohr Bohr model Bohr energy Does Bohr make sense

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