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Unformatted text preview: “We choose to examine a phenomenon which is impossible, absolutely i m p o s s i b l e , to explain in any classical way, and which has in it the heart of quantum mechanics. In reality, it contains the o n l y mystery.”Richard P. Feynman Introduction to Quantum Mechanics • This week and the next are critical for the course • Week 3 – Lect. 5,6: Light as Particles  Particles as waves  WaveParticle Duality  Probability Uncertainty Principle  “Weirdness” of Quantum Mechanics • Week 4 – Lect. 7,8: Schrödinger Equation  Definite predictions of quantum behavior  Examples of particles in infinite wells, finite wells  Leads up to rest of course • Midterm Exam – Monday, Feb. 11  will cover Lectures 17 and qualitative aspects of lecture 8 • Week 4 – The discussion and the quiz will be on material in lecture 7 • Week 4 – Online homework covers material in lecture 7 – due on Thur. Feb. 14, but we strongly encourage you to look at the homework before the midterm! • Review – Sunday, Feb. 10  office hours Feb. 10 and 11 Introduction to Quantum Mechanics • This week and the next are critical for the course • Week 3 – Lect. 5,6: Light as Particles  Particles as waves  WaveParticle Duality  Probability Uncertainty Principle  “Weirdness” of Quantum Mechanics • Week 4 – Lect. 7,8: Schrödinger Equation  Definite predictions of quantum behavior  Examples of particles in infinite wells, finite wells  Leads up to rest of course • Midterm Exam – Monday, Feb. 11  will cover Lectures 17 and qualitative aspects of lecture 8 • Week 4 – The discussion and the quiz will be on material in lecture 56 • Week 4 – Online homework covers material in lecture 7 – due on Thur. Feb. 14, but we strongly encourage you to look at the homework before the midterm! • Review – Sunday, Feb. 10  office hours Feb. 10 and 11 Introduction to Quantum Mechanics: Light as Particles f (x10 14 Hz) V stop (v) 0.5 1 1.5 2 2.5 3 3.5 5 10 15 f S 1 S 2 + V Collector Metal Surface electrons A Overview Overview c Photoelectric Effect → light as particles c “Photons” – quanta of electromagnetic waves c Relation of energy and frequency of a photon c Photon momentum c Key relations of quantum mechanics: c E=hf or E = ћ ϖ ћ = h/2 π c p=h/ λ c Waveparticle Duality c Two slit experiment reveals the profoundly different nature of the quantum world from our everyday experiences c Weird Quantumness c The truth is stranger than fiction! Wave Wave particle Duality for particle Duality for Light and Matter Light and Matter c In Physics 212 and the first 4 Lectures of Physics 214, we considered “light” as a wave c Definitively established by experiments: c Electromagnetic waves exhibit interference – diffraction of visible light, xray diffraction from crystals, radio waves bend around corners, . . . ....
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 Spring '07
 Debevec
 mechanics, Photon, Light

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