what is band theory
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Answer:
Unified Theory, previously Luma, were an American rock band from Seattle, Washington, formed in 1998. The lineup consisted of Chris Shinn (lead vocals, rhythm guitar), formerly of Celia Green, former Blind Melon members Christopher Thorn (lead guitar) and Brad Smith (bass) as well as Dave Krusen (drums) formerly of Pearl Jam.
Explanation: Band theory, in solid-state physics, theoretical model describing the states of electrons, in solid materials, that can have values of energy only within certain specific ranges. The behaviour of an electron in a solid (and hence its energy) is related to the behaviour of all other particles around it. This is in direct contrast to the behaviour of an electron in free space where it may have any specified energy. The ranges of allowed energies of electrons in a solid are called allowed bands. Certain ranges of energies between two such allowed bands are called forbidden bands—i.e., electrons within the solid may not possess these energies. The band theory accounts for many of the electrical and thermal properties of solids and forms the basis of the technology of solid-state electronics.
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