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Unformatted text preview: Homework #10 — PHYS 603 — Spring 2008 Deadline: Thursday, May 1, 2008, in class Professor Victor Yakovenko Office: 2115 Physics Web page: http://www2.physics.umd.edu/ ~ yakovenk/teaching/ Textbook: Silvio Salinas, Introduction to Statistical Physics Springer, 2001, ISBN 0-387-95119-9 Do not forget to write your name and the homework number! Each problem is worth 10 points. Ch. 11 Phonons and Magnons 1. Problem 11.1. Debye temperature and Fermi temperature. 2. Problem 11.3. C P- C V at low temperature. Be sure to do this Problem for C , not c . In this book, the definition is c = C/N , which is not very practical for phonons, whose number N is not conserved and depends on temperature. To solve this Problem, do the following steps: (a) Determine how the entropy S of the 3D phonon gas depends on temperature T at low temperatures. Does S at T → 0 satisfy the Nernst theorem (the third law of thermodynamics)?...
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