Lecture20

Lecture20 - PHY102 1 Major Concepts in Physics Lecture 20....

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Unformatted text preview: PHY102 1 Major Concepts in Physics Lecture 20. Prof Simon Catterall Office 309 Physics, x 5978 smc@physics.syr.edu http://physics/courses/PHY102.08Spring PHY102 Announcements Exam 3 Monday April 14 in class Material: everything since exam 2. eg temperature, heat, work, laws of thermodynamics. Photon. Photoelectric effect. Wave-particle duality. Electron volts. Bohr model of H atom basic ideas. Electron as a wave. Diffraction, interference. Uncertainty principle. Pauli exclusion principle Lasers, chemical bonding PHY102 Reviews In class Wednesday In workshop Thurs/Friday Practice exam workshop Hw5 due this week Solutions to quiz3, hw3,hw4 etc online PHY102 Recap Classical picture of particles fails for eg electrons exhibit wave-like properties De Broglie wavelength very small for ordinary objects Uncertainty principle: cannot localize quantum particle energies of atoms tied to size of h (Plancks constant) and size. Atomic structure. Today: try to understand why atoms join together to make molecules PHY102 Size of atom Use uncertainty principle plus Coulombs law let a=size of atom p=typical momentum of electron in atom ap=h e 2 /(4 0 a)=potential energy=kinetic energy (roughly) a=h 2 /me 2 =10-10 m about correct ! PHY102...
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Lecture20 - PHY102 1 Major Concepts in Physics Lecture 20....

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