Materials Assignement 3 Attempt 1

Materials Assignement 3 Attempt 1 - WebCT Quiz Homepage

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WebCT Quiz Homepage http://webct.mcmaster.ca/SCRIPT/MATLS_1M03_T2_06_newRestore/s. .. 1 of 4 17/02/2006 12:40 AM View Results Name: BRYCE JONES Attempt: 1 / 3 Out of: 27 Started: February 11, 2006 8:39pm Finished: February 17, 2006 12:38am Time spent: 123 hr, 59 min., 0 sec. Question 1 (2 points) The conductivity of a 3.24 mm-diameter cylindrical silicon specimen if found to be 23.2 (Ohm-m) -1 . Calculate the resistance (in Ohm) of a 39.5 mm length of the specimen. Use decimal notation, digits after decimal: 0 Student response: 9e-6 Ohm Correct answer: 207 Ohm General feedback: To solve this question you need to know the difference between conductivity and resistivity. For more information, see page 613 of the text. Equation 18.2 is also useful. Score: 0.2 / 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: 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. Fermi 100% Answer evaluated by the formula. (100%) General feedback: See page 616 of the text for more information. Score: 1 / 1 Question 4 (2 points) At room temperature the electrical conductivity and electron mobility for a material are 5.3 x 10 8 (Ω-m) -1 and 0.0037 m 2 /V-s, respectively. Calculate the number of free electrons per cubic meter (in m^-3) for this material at room temperature. Use scientific notation, significant figures in answer: 2 Student response: 8.9e29 m^-3 Correct answer: 9.0E29 (9.0 * 10 29 ) m^-3 General feedback: For more information on electron mobility, see page 619 of the text. Equation 18.8 is particularly useful for solving this problem. Score: 2 / 2 Question 5 (2 points) A wafer of silicon (an intrinsic semiconductor) is connected to a battery and a lightbulb. If a current is run through the system, will the lightbulb be
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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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Materials Assignement 3 Attempt 1 - WebCT Quiz Homepage

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