HW05-Phys416-2010fall

HW05-Phys416-2010fall - Homework 5 Phys 416 Due Friday Oct...

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Homework 5 Phys 416 Due : Friday, Oct. 1, 2010, at 3:00 pm in Room 144. Note : On your HW write: “ PHYS 416 HW, Grader Marius Radu Do problems 5.6, 5.8, 5.10, 6.1, 6.2 in the text. Additional problems: A. Heat capacity of a penny (a) Please find the specific heat capacity of a penny using general equations obtained in Debye approximation for solids at high temperatures (Lecture 7). Assume that a penny is solid copper (true for pennies made before 1857), and use copper atomic weight of 63.55 g/mol. Compare that theoretical prediction of Gibbs model with the measured heat capacity of copper at various temperatures (Rev. Sci. Instrum. 58 (1987) 639): T(K) – C (J/g . K) 20 K – 0.007 100 K – 0.252 280 K – 0.381 300 K – 0.385 (~room temperature) 320 K – 0.388 (b) Since 1982 penny is 97.5 % zinc (core) coated with 2.5% copper (you can ignore copper). Would the heat capacity (in J/gK) of a zinc penny be much different from that of a copper penny? (atomic weight of zinc is 65.39
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HW05-Phys416-2010fall - Homework 5 Phys 416 Due Friday Oct...

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