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MATLS 1M03 - WebCT - Assignment 3 - Try 4

# MATLS 1M03 - WebCT - Assignment 3 - Try 4 - Learning System...

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View Results Name: BRIAN NIXON Attempt: 1 / 3 Out of: 28 Started: February 19, 2009 5:57pm Finished: February 24, 2009 4:24am Time spent: 106 hr, 26 min., 58 sec. Question 1 (1 point) For a metal that has an electrical conductivity of 8.0 x 10 7 ( Ω -m) -1 , calculate the resistance (in Ohm) of a wire 2.1 mm in diameter and 5.1 m long. Use decimal notation, digits after decimal: 3 Student response: 0.018 Ohm Correct answer: 0.018 Ohm General feedback: This problem can be solved using an extension of Ohm's Law. For more information, see pages 612-613 in the text. Equation 18.2 should be particularly useful. Score: 1 / 1 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) For a material that contains N atoms, how many electron states will there be in a p band? Student response: Correct Response Student Response Answer Choices a. N b. 2N c. 3N d. 4N e. 6N General feedback: For more information on energy band structures, see pages 614-617 in the text. Score: 1 / 1 Question 4 (1 point) Determine how long (in s) it will take an electron to traverse a 39.9 mm length of crystal at room temperature. The electron mobility of the material is 0.321 m 2 /V-s, and the magnitude of the electric field is 1844 V/m. Use scientific notation, significant figures in answer: 3 Page 1 of 5 Learning System Quiz Homepage 3/9/2009 http://webct.mcmaster.ca/SCRIPT/MATLS_1M03_T2_09/scripts/student/serve_quiz_marke. ..

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Student response: 6.74E-5 s Correct answer: 6.74E-5 (6.74 * 10 -5 ) s General feedback: Find the drift velocity first, then use that value to determine how long the electron would take to travel the distance. For more information of electron mobility and drift velocity, see page 619 in the text. Score: 1 / 1 Question 5 (1 point) A spool of copper wire is connected to a battery and a lightbulb. If a current is run through the system, will the lightbulb be
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MATLS 1M03 - WebCT - Assignment 3 - Try 4 - Learning System...

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