Quiz 11 - D D kT eD n ion ion = e=1.602x10-19 C/atom...

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William Bradford Shockley (February 13, 1910 – August 12, 1989) was a British-born American physicist and inventor. Along with John Bardeen and Walter Houser Brattain, Shockley co-invented the transistor , for which all three were awarded the 1956 Nobel Prize in physics. Shockley's attempts to commercialize a new transistor design in the 1950s and '60s led to San Francisco's "Silicon Valley" becoming a hotbed of computer innovation. In his later life, Shockley was a professor at Stanford, and he also became a staunch advocate of eugenics. MEEN 222 – 501 Fall 2009 Quiz #11 Student: SOLUTION Print First and Last Name
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1. At temperatures between 540 o C and 727 o C the activation energy and pre-exponential for diffusion coefficient of Na + in NaCl are 173000 J/mol and 4.0x10 -4 m 2 /s respectively. Calculate the mobility of Na+ ions at 600 o C. = RT Q exp
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Unformatted text preview: D D kT eD n ion ion = e=1.602x10-19 C/atom R=8.314 J/molK k=1.38x10-23 J/atomK 2. Indicate whether the following statements are TRUE or FALSE -Electrical conductivity of extrinsic semiconductors increases continuously with temperature because concentration of both mobile electrons and holes also increases with temperature. TRUE / FALSE -In both good electronic conductors and semiconductors, electrical conductivity increases with amount of impurities. TRUE / FALSE -Increasing the number of crystalline defects in metals causes decrease in electrical conductivity since they serve as scattering centers for conduction electrons. TRUE / FALSE 3. Which of the curves belongs to the extrinsic semiconductor? a) Curve 1 b) Curve 2 c) Both 4. 1 point + 0.5 for unit 1 point + 0.5 for unit 1 point 1 point 1 point 1 point 1 oint 1 2 2 oints...
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This note was uploaded on 01/05/2010 for the course MEEN 222 taught by Professor Radovic during the Fall '08 term at Texas A&M.

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Quiz 11 - D D kT eD n ion ion = e=1.602x10-19 C/atom...

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