Conduction of electricity in semiconductors

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The conduction band in semiconductors refers to the energy range that allows electrons to move freely, facilitating electrical conductivity. In contrast, the valence band contains electrons that are bound to their atoms. The energy gap between these two bands is crucial in determining a material's classification as a conductor, insulator, or semiconductor. Understanding these bands is essential for grasping semiconductor properties and applications. Resources like Hyperphysics provide detailed explanations of band theory in solids.
kartikwat
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When studying about semiconductos what are the valence band and conductivity band .what are its properties,where is it addressed.
 
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It's all in the names! The conduction band is the range of energies required to free an electron from its atom, letting it move freely through the lattice, therefore conducting electricity. The valence band is then the highest range of energies of electrons which are bound to the atom. The energy gap between the valence band and the conduction band determines whether a material is a conductor, insulator or semiconductor.

Hyperphysics has rather a good writeup on the band theory of solids. http://hyperphysics.phy-astr.gsu.edu/hbase/solids/band.html
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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