MSE262_PrelimI_2008_2009

# MSE262_PrelimI_2008_2009 - ENGRD 262 MS&E 262 Spring 2008...

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Spring 2008 Prelim I March 27, 2008 Problem 1: a) Identify the following plane. (5 points) Consider two theoretical materials D and K, given the following properties: D: SC ρ = 3.14 g/cm 3 , M = 12.01 g/mol K: BCC ρ = 4.56 g/cm 3 , M = 10.81 g/mol b) Find the lattice parameter and atomic concentration. (10 points) c) For the given two theoretical materials compare the (100) and (110) planar concentrations of atoms and state which plane has a higher electrical conductivity for each material and why. (10 points) Z X Y

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Problem 2: a) What factors impact the signal transmission within a microchip and which of those factors do material scientists work on these days. (5 points) b) Calculate the drift mobility and the mean scattering time of conduction electrons in Al at room temperature, given that the resistivity of Al is 26.5 nΩ m . The density of aluminum is 2.7 g/cm 3 , its atomic mass is 26.982 g/mol and valence is three. (10 points) c) What is the drift velocity if the applied electric field is
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MSE262_PrelimI_2008_2009 - ENGRD 262 MS&E 262 Spring 2008...

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