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MATLS 1M03 - WebCT - Assignment 3 - Try 2

# MATLS 1M03 - WebCT - Assignment 3 - Try 2 - WebCT Quiz...

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WebCT Quiz Homepage http://webct.mcmaster.ca/SCRIPT/MATLS_1M03_T2_07/scripts/student. .. 1 of 5 2/16/2007 8:23 PM View Results Name: AARON MURENBEELD Attempt: 2 / 3 Out of: 24 Started: February 10, 2007 1:53am Finished: February 16, 2007 8:22pm Time spent: 162 hr, 28 min., 50 sec. Question 1 (1 point) Calculate the electrical conductivity [in (Ohm-m)^-1] of a 4.44 mm-diameter cylindrical silicon specimen 37.0 mm long through which a current of 1.17 A passes in the axial direction. A voltage of 10.8 V is measured across two probes that are separated by 40.1 mm. Note: Enter the units precisely as indicated above. Use decimal notation, digits after decimal: 0 Student response: Not answered Correct answer: 281 (Ohm-m)^-1 General feedback: This problem can be solved using an extension of Ohm's Law. For more information, see page 613 of the text and equation 18.3. Score: 0 / 1 ( Question not answered. ) Question 2 (1 point) The typical electrical conductivity value/range for metals is: Student response: Correct Response Student Response Answer Choices a. 10 7 ( -m) -1 b. 10 -20 to 10 -10 ( -m) -1 c. 10 -6 to 10 4 ( -m) -1 General feedback: Metals typically have electrical conductivities on the order of 10 7 ( -m) -1 . See page 614 in 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: 0 / 1 Question 4 (1 point) 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.

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WebCT Quiz Homepage http://webct.mcmaster.ca/SCRIPT/MATLS_1M03_T2_07/scripts/student. .. 2 of 5 2/16/2007 8:23 PM 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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MATLS 1M03 - WebCT - Assignment 3 - Try 2 - WebCT Quiz...

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