MATLS 1M03 - WebCT - Assignment 3 - Try 3

MATLS 1M03 - WebCT - Assignment 3 - Try 3 - WebCT Quiz...

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WebCT Quiz Homepage http://webct.mcmaster.ca/SCRIPT/MATLS_1M03_T2_06_newRestore/s. .. 1 of 4 17/02/2006 7:22 PM View Results Name: BRYCE JONES Attempt: 3 / 3 Out of: 27 Started: February 17, 2006 11:16am Finished: February 17, 2006 7:20pm Time spent: 8 hr, 3 min., 42 sec. Question 1 (2 points) Consider a metal that has an electrical conductivity of 33.8 x 10 7 (Ω-m) -1 . It is drawn into a wire 3.67 mm in diameter and 2.98 m long. Compute the magnitude of the electric field (in V/m) across the ends of the wire if the potential drop across them is 7.08 V. Use decimal notation, digits after decimal: 2 Student response: 2.38 V/m Correct answer: 2.38 V/m General feedback: This problem can be solved using an extension of Ohm's Law. For more information, see pages 612-613 in the text. If you're having trouble, consider the units and what they represent. Score: 2 / 2 Question 2 (1 point) The typical electrical conductivity value/range for semiconducting materials is: Student response: Correct Response Student Response Answer Choices a. 10 7 (Ω-m) -1 b. 10 -20 to 10 -10 (Ω-m) -1 c. 10 -6 to 10 4 (Ω-m) -1 General feedback: Semiconducting materials typically have electrical conductivities in the range of 10 -6 to 10 4 (Ω-m) -1 . See page 614 of the text. Score: 1 / 1 Question 3 (1 point) True or False? Energies for holes are greater than the Fermi energy? Student response: Correct Response Student Response Answer Choices a. True b. False General feedback: Energies for holes are less than the Fermi energy. See page 617 of the text for more information. Score: 1 / 1 Question 4 (2 points) When an electric field is applied, in which direction do the holes in the crystal structure move? Student response: Correct Response Student Response Answer Choices a. In the same direction as the electric field. b. In the direction opposite to that of the electric field. General feedback: When an electric field is applied, the holes "move" in the same direction as the electric field . See pages 623-624 of the text for more information about holes. Score:
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This note was uploaded on 02/08/2010 for the course MATLS 1M03 taught by Professor Okon during the Winter '09 term at McMaster University.

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MATLS 1M03 - WebCT - Assignment 3 - Try 3 - WebCT Quiz...

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