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The concept of energy bands and band gaps in materials. It explains the difference between conductors, insulators, and semiconductors based on their energy bands and band gaps. The document also covers the concept of electrons and holes in energy bands and how they contribute to the conductivity of materials. It further explains how energy bands and band gaps can be understood using the R-k method and how to calculate the energy gap between the conduction and valence bands. Finally, the document discusses the emission and absorption of energy in materials and how it relates to energy bands and band gaps.
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