1M03 2009 ASSIGNMENT 3-1 ¿¯

1M03 2009 ASSIGNMENT 3-1...

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View Results Name: SOO NAM Attempt: 1 / 3 Out of: 28 Started: February 14, 2009 10:36pm Finished: February 22, 2009 6:06am Time spent: 175 hr, 30 min., 14 sec. Question 1 (1 point) Calculate the electrical conductivity [in (Ohm-m)^-1] of a 3.25 mm-diameter cylindrical silicon specimen 31.0 mm long through which a current of 1.08 A passes in the axial direction. A voltage of 11.6 V is measured across two probes that are separated by 49.3 mm. Note: Enter the units precisely as indicated above. Use decimal notation, digits after decimal: 0 Student response: 348 (Ohm-m)^-1 Correct answer: 553 (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 / 1 Question 2 (1 point) The typical electrical conductivity value/range for metals 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: Metals typically have electrical conductivities on the order of 10 7 ( Ω -m) -1 . See page 614 in the text. Score: 1 / 1 Question 3 (1 point) True or False? All electrons present in a material are available to participate in the conduction process. Student response: Correct Response Student Response Answer Choices a. True b. False General feedback: False . The number of electrons available for electrical conduction in a particular material is related to the arrangement of electron states or levels with respect to energy, and the manner in which these states are occupied by electrons. See page 614 of the text for more information. Score: 1 / 1 Question 4 (1 point) Determine how long (in s) it will take an electron to traverse a 43.4 mm length of crystal at room temperature. The electron mobility of the material is 0.362 m 2 /V-s, and the magnitude of the electric field is 1802 V/m. Use scientific notation, significant figures in answer: 3 Student response: 6.65e-5 s Correct answer: 6.65E-5 (6.65 * 10 -5 ) s
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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:
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1M03 2009 ASSIGNMENT 3-1...

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