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Unformatted text preview: what happens for states having E > 0 – strangely, quantum mechanics causes both potential dips and humps to scatter! Physics 486 Fall 2007 2) Two conducting copper wires are separated by a thin insulating barrier made of copper-oxide (CuO). The oxide barrier can be modeled as a square barrier of height V o =10 eV and width L = 1 nm. A 1-mA current of 7 eV electrons in one of the wires is incident on the oxide barrier. (a) Calculate the product κ L for this system. Can you use any approximations for the transmission coefficient T? (b) Use the exact expression for the transmission coefficient to determine the probability that an electron will tunnel through the oxide barrier. (c) Given that there is a current of 1-mA in one of the wires, about how many electrons should tunnel through the barrier per second? (d) How much current will tunnel through to the adjacent wire? What happens to the remaining current?...
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