lecture22 - Physics 102: Lecture 22 Quantum Mechanics:...

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Quantum Mechanics: Blackbody Radiation, Photoelectric Effect, Wave-Particle Duality Physics 102: Lecture 22
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Hour Exam 3 Monday, Apr 19 Covers Lectures through Lecture 21 (no single-slit diffraction!) Homework through HW 10 Discussions through Disc 10 Review session Sunday, Apr 18 Sunday, Apr 18, 3pm, 141 Loomis Will cover Fall ’09 exam 3
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Recap. Interference: Coherent waves Full wavelength difference = Constructive ½ wavelength difference = Destructive Multiple Slits Constructive d sin( θ ) = m λ ( m=1,2,3…) Destructive d sin( θ ) = (m + 1/2) λ 2 slit only More slits = brighter max, darker mins Huygens’ Principle: Each point on wave front acts as coherent source and can interfere. (see Lab 8) Single Slit: Destructive: w sin( θ ) = m λ ( m=1,2,3…) Resolution: Max from 1 at Min from 2 50 o p s i t e !
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State of Late 19 th Century Physics Two great theories Newton’s laws of mechanics, including gravity Maxwell’s theory of electricity & magnetism, including propagation of electromagnetic waves But…some unsettling experimental results calls into question these theories Einstein and relativity The quantum revolution
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At very small sizes the world is VERY different! Energy is discrete, not continuous. Everything is probability; nothing is for certain. Particles often seem to be in two places at same time.
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This note was uploaded on 01/25/2012 for the course PHYS 102 taught by Professor Lee during the Spring '08 term at University of Illinois, Urbana Champaign.

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lecture22 - Physics 102: Lecture 22 Quantum Mechanics:...

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