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electric resisitivity a copper is 1.77*10^-8 ohm m. copper has FCC structure with cube side s=3.61Angstrom...

electric resisitivity a copper is 1.77*10^-8 ohm m. copper has FCC structure with cube side s=3.61Angstrom and every atom donate 1 free electron.
find:
a. relaxation time
b. average velocity electron in field E=100V/m

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