EXAM2-2009key - EXAM II INTRODUCTION TO MATERIALS SCIENCE -...

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EXAM II INTRODUCTION TO MATERIALS SCIENCE - MSE 150 SPRING 2009 HONOR CODE I PLEDGE MY HONOR THAT I HAVE NEITHER GIVEN OR RECEIVED AID ON THIS EXAMINATION. SIGNATURE _________________________________ PRINT NAME ________________________________ CAST YOUR VOTE TO DECIDE WHETHER THERE WILL BE A BONUS QUIZ ON WEDNESDAY, MARCH 25, 2009 YES ______ NO ______ DO NOT TURN THIS PAGE UNTIL 10 MINUTES AFTER THE HOUR YOU HAVE 50 MINUTES TO COMPLETE THIS EXAM 1
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(10 points) The resistivity of pure copper is 2.42 x 10 -8 m at 132 o C and 1.6 x 10 -8 m at 0 o C. Calculate the temperature resistivity coefficient, α T , for copper. 4
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(15 points) In the intrinsic condition, the compound semiconductor, GaAs has an electrical conductivity of 1.66 x 10 -7 ( Ω m) -1 at 300 K with a band gap energy of 1.47 eV. Calculate the electrical conductivity at 200 o C. Show your work for partial credit. (k = 8.62 x 10 -5 eV/K) 5
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(10 points) Silicon is doped with 4.5 x 10 21 boron atoms/m 3 . Boron, column III of the periodic
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EXAM2-2009key - EXAM II INTRODUCTION TO MATERIALS SCIENCE -...

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