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EXAM 3-2009 ANS KEY

# EXAM 3-2009 ANS KEY - MSE150.02 EXAM 3 SPR2009 EXAM III...

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MSE150.02 EXAM 3 SPR2009 EXAM III INTRODUCTION TO MATERIALS SCIENCE - MSE 150.02 SPRING 2009 HONOR CODE I PLEDGE MY HONOR THAT I HAVE NEITHER GIVEN OR RECEIVED AID ON THIS EXAMINATION. I FURTHER PLEDGE THAT, IF I HAVE REASON TO SUSPECT THAT THE CODE HAS BEEN VIOLATED, I HAVE TAKEN OR WILL TAKE ACTION AS OUTLINED IN THE CODE. SIGNATURE _________________________________ PRINT NAME ________________________________ DO NOT TURN THIS PAGE UNTIL 11:10 AM YOU HAVE 50 MINUTES TO COMPLETE THIS EXAM 1

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MSE150.02 EXAM 3 SPR2009 QUESTION 1 (8 points) Shown below are the energy curves for the formation of nuclei as a function of nucleus radius. Label the following curves and points on the diagram: a) The driving force for nucleation b) The retarding force for nucleation c) The total energy change during nucleation d) The critical radius for stable nucleation QUESTION 2 (2 points) During the solidification of a molten metal in an industrial mold, which form of nucleation is more likely to occur: Homogeneous Nucleation Heterogeneous Nucleation Retarding Force Driving Force Total energy change Critical Radius 2
MSE150.02 EXAM 3 SPR2009 QUESTION 3 (2 points) What is the name of the process by which a microscopic pattern is transferred to the silicon wafer surface of the integrated circuit? Photolithography QUESTION 4 (10 points) Solid-state diffusion can be described by the two following equations: a) What is the name of equation 2?

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