Lect05 - “We choose to examine a phenomenon which is...

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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 -- Wave-Particle 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 1-7 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 -- Wave-Particle 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 1-7 and qualitative aspects of lecture 8 • Week 4 – The discussion and the quiz will be on material in lecture 5-6 • 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 Wave-particle 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, x-ray diffraction from crystals, radio waves bend around corners, . . . ....
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Lect05 - “We choose to examine a phenomenon which is...

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