Manfra14-2011 - CHAPTER 4 Structure of the Atom 4.1 4.2 4.3...

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4.1 The Atomic Models of Thomson and Rutherford 4.2 Rutherford Scattering 4.3 The Classic Atomic Model 4.4 The Bohr Model of the Hydrogen Atom 4.5 Successes & Failures of the Bohr Model 4.6 Characteristic X-Ray Spectra and Atomic Number CHAPTER 4 Structure of the Atom Problems due next Monday Feb 28th: Chapter 4: 5, 8, 9, 14, 16, 22, 23, 36, 42, 48 Niels Bohr (1885-1962)
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2 2 2 0 1 v 4 e e m F r r πε = = 4.3: The Classical Atomic Model Consider an atom as a planetary system. The Newton’s 2nd Law force of attraction on the electron by the nucleus is: where v is the tangential velocity of the electron: The total energy is then: 0 v 4 e mr = 2 2 1 1 2 2 0 v 4 e K m r = = This is negative, so the system is bound, which is good.
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The Planetary Model is Doomed From classical E&M theory, an accelerated electric charge radiates energy (electromagnetic radiation), which means the total energy must decrease. So the radius r must decrease!! Physics had reached a turning point in 1900 with Planck’s hypothesis of
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This note was uploaded on 04/23/2011 for the course PHYS 342 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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Manfra14-2011 - CHAPTER 4 Structure of the Atom 4.1 4.2 4.3...

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