SG_Chap28 - 4/20/2009 Chapter 28 Atomic Physics 28.1 Early...

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4/20/2009 1 Chapter 28 Atomic Physics 28.1 Early models of atom J.J. Thomson’s model of the atom A volume of positive charge Electrons embedded throughout the volume Rutherford’s Planetary model Positive charge is concentrated in the center of the atom, called the nucleus Electrons orbit the nucleus like planets orbit the sun Rutherford’s electrons are undergoing a centripetal acceleration 28.3 The Bohr model The electron moves in circular orbits around the proton under the influence of the Coulomb force of attraction The Coulomb force produces the centripetal acceleration Only certain electron orbits are stable The energy of the atom remains constant in these orbits Radiation is emitted by the atom when the electron “jumps” from a more energetic initial orbit to a lower energy orbit and is given by, E i – E f = h ƒ His model includes both classical and quantum physics ideas His model included an attempt to explain why the atom was stable Bohr Radius and energy
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This note was uploaded on 09/13/2009 for the course PHY 102 taught by Professor Luo during the Spring '08 term at SUNY Buffalo.

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SG_Chap28 - 4/20/2009 Chapter 28 Atomic Physics 28.1 Early...

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