Meen 222- Quiz 8

# Meen 222- Quiz 8 - the wire is 0.04 V What is current...

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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 – 503 Fall 2008 Quiz #8 Student: Print First and Last Name

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1. Compute the resistance of aluminum wire 5 mm in diameter and 5 m long at room temperature if σ Al =3.8x10 7 ( m) -1 . What would be current flow if the potential drop across the ends of
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Unformatted text preview: the wire is 0.04 V? What is current density? What is the magnitude of electric field across the ends of the wire? A l R ρ = IR V = A I j = l V E = AT T + ρ = ρ σ Al =3.8x10 7 ( Ω m)-1 2. 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 D D kT eD n ion ion = μ e=1.602x10-19 C/atom R=8.314 J/molK k=1.38x10-23 J/atomK 0.5 point + 0.5 for unit 0.5 point + 0.5 for unit 1 point + 0.5 for unit 1 point + 0.5 for unit 1 point + 0.5 for unit 1 point + 0.5 for unit 1 point 1 oint...
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Meen 222- Quiz 8 - the wire is 0.04 V What is current...

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