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(a) The band theory of solids can be used to qualitatively explain the difference in electrical...

(a) The band theory of solids can be used to qualitatively explain the difference in electrical conductivity between metals,

(a) The band theory of solids can be used to qualitatively explain the difference in electrical conductivity between metals, semiconductors and insulators. Assume a pure solid with no impurities added and answer the following questions. (1) What do the energy bands represent in a solid. (ii) What is the relationship between these bands in the solid and the quantum levels of electrons in an individual atom? (ii) Use sketches to show how the energy band structure of conductors, semiconductors and insulators will differ. (iv) Write down an expression for the electrical conductivity of a material and define all the variables in your equation. (v) Now use your equation from (iv) and the sketches of band structure from (iii) to explain the differences in electrical conductivity between metals, semiconductors and insulators.
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(1) Energy levels. bands Collection of closely spaced energy electronoic statssof Energy bands are band Which electrons avialFor insulator کے Conduction band bad band gap TUT/U/T/I velna bond for Semiconductors Conduction band band gap valence band (V.) in metal. no of CB and U.B are overlap each lap each other and large Elections are avial able for conduction of current.

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