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Lecture01.AccessibleStates.Fall2010

Lecture01.AccessibleStates.Fall2010 - Announcements...

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Announcements Homework 1 DUE Friday, Sept. 3, 2010, at 3:00 pm in Room 144. Note: On your HW write: “PHYS 416 HW, Grader Marius Radu” http://www.physics.purdue.edu/academic_programs/courses/phys416/ Instructor: Prof. Sergei Savikhin Office: PHYS 64 Office Hour: By appointment Telephone: 494-3017 Email: [email protected] Grader: Marius Radu Office: PHYS 261 Office Hour: TBA Telephone: ? Email: [email protected] Syllabus on the course website:
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Today Stationary Quantum State (“state”) observables do not change Atom in a Box at www.daugerresearch.com Degeneracy = multiplicity # of states at the same energy Fundamental assumption of statistical mechanics: Ising model (Binary or two-state model) Multiplicity Function A closed system is equally likely to be in any accessible state
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Changing? Look at the table. Which properties are changing? Which are not changing? Changing Not Changing Statistical Mechanics -- properties of many particles. Probabilities will matter.
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Statistical Physics How to connect the microscopic properties (lots of changes) to the macroscopic properties (not changing much) We will care about: N = # atoms T = temperature V = volume U = total energy Deep philosophical issue: Microscopic: physical laws are reversible in time Macroscopic: They’re not always reversible!
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