Question

What is the basic physical principle responsible for the presence of energy bands rather than specific energy levels in a solid?

Answer 1

in solid-state physics, the electronic band structure (or simply band structure) of a solid describes the range of energies that an electron within the solid may have (called energy bands, allowed bands, or simply bands) and ranges of energy that it may not have (called band gaps or forbidden bands).

Band theory derives these bands and band gaps by examining the allowed quantum mechanical wave functions for an electron in a large, periodic lattice of atoms or molecules. Band theory has been successfully used to explain many physical properties of solids, such as electrical resistivity and optical absorption, and forms the foundation of the understanding of all solid-state devices (transistors, solar cells, etc.).

Answer 2

Answer:

Band theory is the basic physical principle responsible for the presence of energy bands rather than specific energy levels in a solid.

Explanation:

Band theory derives these bands and band gaps by investigating the permitted quantum mechanical wave operations for an electron in a large, periodic lattice of atoms or molecules. The band approach has been successfully utilized to describe many physical properties of solids, such as electrical resistivity and optical absorption, and forms the basis of the understanding of all-solid-state instruments (transistors, solar cells, etc.).

in solid-state physics, the electronic band structure (or simply band structure) of a solid represents the range of energies that an electron within the solid may include (named energy bands, allowed bands, or simply bands) and ranges of energy that it may not include (called band gaps or forbidden bands).

Therefore, Band theory exists as the basic physical principle responsible for the existence of energy bands rather than precise energy levels in a solid.

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