Phy107HE3Review - Hour Exam 3 Review Hour Exam 3 Wednesday...

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Mon. Nov 29 Phy107 Hour Exam 3 Review Hour Exam 3 Review Hour Exam 3 : Wednesday, Dec. 1 In-class (1300 Sterling Hall) Twenty multiple-choice questions Will cover: 13 (Basic Quantum Mechanics) 14 (Uses of Quantum Mechanics) Addl. Lecture Material (Symmetry, solids, superconductivity) 15, 16 (The nucleus, fission & fusion) You should bring Your student ID 1 page notes, written double sided – Calculator Pencil for marking answer sheet
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Mon. Nov 29 Phy107 Hour Exam 3 Review Exam Review: Topics by chapter Chap. 13: Principles of quantum mechanics Light quantization, matter waves. Chap. 14: Uses of quantum mechanics Hydrogen atom, the wavefunction, uncertainty principle, entanglement. Addl Topics: More quantum mechanics Spin, indistinguishability & symmetry, solids, superconductivity Chap. 15: Physics of the nucleus Structure of nucleus, radiaoactive decay, half-life Chap. 16: Fission and fusion Fission, fusion, nuclear weapons, reactors
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Mon. Nov 29 Phy107 Hour Exam 3 Review Chap. 13: Quantum Mechanics Quantization of light Light comes in discrete clumps (photons) Light shows both particle and wave-like properties Evidence for particel properties is photoelectric effect & black-body radiation Matter waves Matter shows both particle and wave-like properties Evidence for wave properties is interference and diffraction deBroglie wavelength = Planck's constant momentum
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Mon. Nov 29 Phy107 Hour Exam 3 Review Photoelectric effect: PARTICLES Einstein says that light is made up of photons, individual ‘particles’, each with energy hf . One photon collides with one electron - knocks it out of metal. If photon doesn’t have enough energy, cannot knock electron out. Intensity ( = # photons / sec) doesn’t change this. Minimum frequency (maximum wavelength) required to eject electron
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Mon. Nov 29 Phy107 Hour Exam 3 Review Blackbody radiation Blackbody radiation Object emits light with a blackbody spectrum. Peak position (color) changes with temperature White hot Red hot
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Mon. Nov 29 Phy107 Hour Exam 3 Review Topic: Wave properties of matter All objects show both wave-like properties and particle-like properties. Electromagnetic radiation (e.g. light) shows interference effects (wave-like properties), but also comes in discrete photons of energy hf (particle-like properties) Matter clearly shows particle-like properties, but also shows interference and diffraction effects (wave-like properties).
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Mon. Nov 29 Phy107 Hour Exam 3 Review Matter waves If light waves have particle-like properties, matter should have wave properties. de Broglie postulated that the wavelength of matter is related to momentum as This is called the de Broglie wavelength. λ = h p
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Mon. Nov 29 Phy107 Hour Exam 3 Review Davisson-Germer experiment Diffraction of electrons from a nickel single crystal.
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