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 [email protected] 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 (Planck’s constant) and size. ¡ Atomic structure. Today: try to understand why atoms join together to make molecules PHY102 Size of atom ¡ Use uncertainty principle plus Coulomb’s law let a=size of atom p=typical momentum of electron in atom ap=h e 2 /(4 πε 0 a)=potential energy=kinetic energy (roughly) Æ a=h 2 /me 2 =10-10 m – about correct ! PHY102...
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## This note was uploaded on 05/18/2008 for the course PHY 102 taught by Professor Simoncatterall during the Spring '08 term at Syracuse.

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

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