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QUIZ4-2009key

# QUIZ4-2009key - PRINT NAME INTRODUCTION TO MATERIAL SCIENCE...

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PRINT NAME ___________________________________ INTRODUCTION TO MATERIAL SCIENCE MSE-150 QUIZ 4 I PLEDGE MY HONOR THAT I HAVE NEITHER GIVEN OR RECEIVED AID ON THIS EXAMINATION. SIGNATURE ____________________________________ (1 point each) Determine if the following statements are True or False. Electrical resistance is a materials property since it is independent of the material’s size or shape. True False The electrical resistivity of a metallic conductor decreases as the material’s temperature is increases. True False At low temperature, the electrical resisitivity of metallic conductors is determined by defects in the microstructure. True False Changes in the electron mobility control the electrical resistivity of metals as a function of temperature. True False Electrical conductivity of intrinsic semiconductors increases exponentially with increasing temperature because the carrier density increases exponentially. True False The equation, σ = n i q ( μ n + μ p ), only applies to intrinsic semiconductors.
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