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Quiz11Sp02

Quiz11Sp02 - Name 2 1 I discussed the lACS in class What do...

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Name 2.? I discussed the lACS in class. What do the letters signify? Mill£h the lACS values 103, 100, 80, and 15 to pure copper, pure silver, C18200 (Cu- 0.8% Cr) and C17600 (Cu- 1.5% Be). 1 * hltemational Annealed Copper Standard -a reference scale for commercial alloys where pure copper has a value of 100. Silver is the best electrical conductor -103. Copper is 100. Cu-Cr is 80. Cu-Be is 15- a high strength age hardening alloy. Recollect that Be is a light element and 1.5 w/o would be a much larger a/o. What have I marked out on this "overhead projector diagram"? 2. * * * * * Resistivity T emperature Pure hnpure Room Temperature J.: What is the probability of an energy level 0.04 eV ~ the Fenni energy level, in a metal, being occupied at -73°C? Boltzmann's constant is 8.65 x 10-5 eV/K. 3. 1 F(E) = E-Ef /kT l+e F(E)= 1 1 + e-(O.O4)/(S.65xlO-S pOO F(E) = 0.9099 Substituting,

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4. What have I marked out on this overhead projector figure? 5~ * * * * Extrinsic .en(cr) or log(cr) l/T 100 million . NOTE TO GET A CONDUcnvJTY ABOUT 1/MILLION THAT OF A METAL, NEED ABOUT 1 PART PER MILLION OF DOPANT.
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Quiz11Sp02 - Name 2 1 I discussed the lACS in class What do...

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