102 lect22_handout - Physics 102: Lecture 22, Slide 1...

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Unformatted text preview: Physics 102: Lecture 22, Slide 1 Quantum Mechanics: Blackbody Radiation, Photoelectric Effect, Wave-Particle Duality Physics 102: Lecture 22 Physics 102: Lecture 22, Slide 2 State of Late 19 th Century Physics Two great theories Newtons laws of mechanics, including gravity Maxwells theory of electricity & magnetism, including propagation of electromagnetic waves Butsome unsettling experimental results calls into question these theories Einstein and relativity The quantum revolution Lecture 28 Lectures 22-25 Classical physics Physics 102: Lecture 22, Slide 3 Quantum Mechanics! 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. Looking at something changes how it behaves. Physics 102: Lecture 22, Slide 4 Three Early Indications of Problems with Classical Physics Blackbody radiation Photoelectric effect Wave-particle duality Physics 102: Lecture 22, Slide 5 Hot objects glow (toaster coils, light bulbs, the sun). As the temperature increases the color shifts from Red (700 nm) to Blue (400 nm) The classical physics prediction was completely wrong! (It said that an infinite amount of energy should be radiated by an object at finite temperature) Blackbody Radiation Physics 102: Lecture 22, Slide 6 Blackbody Radiation Spectrum Visible Light: ~0.4 m to 0.7 m Higher temperature: peak intensity at shorter Wiens Displacement Law: max T = 2.898x10-3 mK Physics 102: Lecture 22, Slide 7...
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This note was uploaded on 02/05/2012 for the course PHYS 102 taught by Professor Carruba during the Spring '09 term at University of Illinois at Urbana–Champaign.

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102 lect22_handout - Physics 102: Lecture 22, Slide 1...

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