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MATLS 1M03 - WebCT - Assignment 3 - Try 1

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

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WebCT Quiz Homepage http://webct.mcmaster.ca/SCRIPT/MATLS_1M03_T2_07/scripts/student... 1 of 5 2/5/2007 3:10 PM View Results Assignment 3 (ch 18 & 19) Name: AARON MURENBEELD Attempt: 1 / 3 Out of: 24 Started: February 5, 2007 3:10pm Finished: February 5, 2007 3:10pm Time spent: 0 min. 17 sec. Question 1 (1 point) Consider a metal that has an electrical conductivity of 7.6 x 10 7 ( -m) -1 . It is drawn into a wire 5.1 mm in diameter and 2.4 m long. Calculate the current density (in A/m^2) if the potential drop across the ends of the wire is 0.060 V. Use scientific notation, significant figures in answer: 2 Student response: Not answered Correct answer: 1.9E6 (1.9 * 10 6 ) A/m^2 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 18.5 should be particularly useful. Score: 0 / 1 ( Question not answered. ) 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 ( -m) -1 b. 10 -20 to 10 -10 ( -m) -1 c. 10 -6 to 10 4 ( -m) -1 General feedback: Semiconducting materials typically have electrical conductivities in the range of 10 -6 to 10 4 ( -m) -1 . See page 614 of the text. Score: 0 / 1 Question 3 (1 point) The energy corresponding to the highest filled electron state at 0 K is called the _____________ energy. Student response: No. Student response Grade Correct answer (Value) 1. Not answered 0% Answer evaluated by the formula. (100%) General feedback: See page 616 of the text for more information. Score: 0 / 1 ( Question not answered. ) Question 4 (1 point) True or False? In a perfect crystal (i.e., without any imperfections), application of an electric field will result in a continuously increasing electric current with time. Student response: Correct Response Student Response Answer Choices
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WebCT Quiz Homepage http://webct.mcmaster.ca/SCRIPT/MATLS_1M03_T2_07/scripts/student... 2 of 5 2/5/2007 3:10 PM General feedback: True . For more information see page 619 in the text.
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