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# HW_CH_12 - IE 320 Spring 2003 Homework Ch 12 Introduction...

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Homework Ch. 12 2 Introduction to Materials Science 12.1 (a) Compute the electrical conductivity of a 5.1-mm (0.2-in.) diameter cylindrical silicon specimen 51 mm (2 in.) long in which a current of 0.1 A passes in an axial direction. A voltage of 12.5 V is measured across two probes that are separated by 38 mm (1.5 in.). (b) Compute the resistance over the entire 51 mm (2 in.) of the specimen. 12.4 Demonstrate that the two Ohm’s law expressions, Equations 12.1 and 12.5, are equivalent. 12.10 Briefly tell what is meant by the drift velocityand mobility of a free electron. 12.10 a) Calculate the number of free electrons per cubic meter for gold assuming that there are 1.5 free electrons per gold atom. The electrical conductivity and density for Au are 4.3 x10 7 ( W -m) -1 and 19.32 g/cm3, respectively. (b) Now compute the electron mobilityfor Au.

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