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10. If there is four electrons located in an infinite quantum with a width of a=1 nanometer (10-9m). In the following figure (a) please use black dots to represent the Ek relation of the four electrons. In the following figure (b) and (c), please plot Ψ(x) and Ψ(x)Ψ(x)*.

11. What kind of energy band structures will metals and semiconductors have? At absolute zero temperature, why metals are electrically conducting and semiconductors are not conducting?