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Spring 2011 PHYS 172: Modern Mechanics Lecture 7 – Uncertainty, Model of solid ,dp/dt Read 3.10, 4.1-4.7, 4.10, 5.1-5.2 EXAM 1 is next week Time: 8:00-10:00 pm Wed Feb 9 Place: Elliott Hall Material: lectures 1-8, HW 1-8 (chapters 1-5 in the book, except 4.11-4.14) Problems: multiple choice, 14 questions (70 points) write-up part, hand graded (30 points) Equation sheet: provided with exam Practice exam + equation sheet: will be posted at the end of this week Note: no lecture on Feb 10 ! Probability and uncertainty Example: a free neutron decays with ~15 minutes: n p e ν + - + + t Probability Can we predict the motion of an electron near a free neutron? A)Yes B) No
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Semitransparent mirror photon Where is the electron? Classical Quantum Clicker poll: The photon will: A) Reflect B) Pass through The Heisenberg uncertainty principle Position and momentum of a particle cannot be both measured simultaneously 1927 Nobel Price: 1932 x x p h Δ Δ Werner Karl Heisenberg 1901-1976 Planck’s constant h = 6.6 10 -34 kg . m
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