quiz 9 example solutions

quiz 9 example solutions - Sample questions for ChE 350...

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Unformatted text preview: Sample questions for ChE 350 Fall 2009 K” Quiz 9 Name:_fl______ 1. At room temperature, the electrical conductivity of intrinsic silicon is 4 x 10'6 Q"cm'I . The electron and hole mobilities of silicon are 1400 cmZV'l sec‘1 and 500 csz"' sec'l , respectively. to '3 (a) What is the 1ntr1n31c carrler concentration in srhcon? l 'g X W (b) What fraction of atoms in silicon contributes a conduction electron? (agi=0.543 nm) ..| . 2A9 X\o 3 cdrow W'WL’V" ‘L M Aw'R—m (0) Estimate the electrical conductivity of silicon doped with boron at a concentration of 1x 1017 cm'3. r—\ R0 Bil-ow ((1) Estimate the electrical current that will flow through a bar of silicon that is 10 um long and 5 nm in diameter, with an electrical conductivity of 4x10'6 Q‘lcm“) 3w. \ V {A Wifii 10w” ’W ”Mil“ “Elma“ 0:13 EA (7-? was"; (6:) thhb‘u—(I We,» mgwlx" " ...
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