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Unformatted text preview: we get K = 2.29 nm , q = 1.25, and therefore T = 0.0165, so above one percent.
-1 3. Tunneling. The maximum safe current in a copper wire with a diameter of 3.0 mm is about 20 A. For
higher currents, the wire melts. In an STM (scanning tunneling microscope), a current of 0.50 nA
passes from the tip to the surface in a filament of diameter 1.2 nm. Compare the current density
(current per cross-section area, in A mm-2) in the copper wire with that in the STM.
STM tip: The current density in the STM tip is over 150 times larger than in the copper wire.
4. Operators. Do the operators for kinetic energy ̂
and for linear momentum ̂
̂ ̂ by applying it to an...
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This note was uploaded on 12/09/2012 for the course CHEM 455 taught by Professor Reinhardt during the Fall '06 term at University of Washington.
- Fall '06