The velocity of an electron at the Fermi level cannot be determined solely based on the energy value of the Fermi level. The Fermi level represents the highest occupied energy level at absolute zero temperature in a solid or a system of electrons, and it determines the energy distribution of electrons within a material.
The Fermi level is typically expressed in terms of energy, specifically electron volts (eV), but it does not directly provide information about the velocity of individual electrons. The velocity of an electron depends on various factors, including its energy, momentum, and the specific system in which it is present.
To determine the velocity of an electron at the Fermi level, one would need additional information such as the band structure of the material, the dispersion relation of the electrons in that material, or the effective mass of the electron within the material's energy band.
The band structure and dispersion relation describe how the energy and momentum of an electron are related in a particular material. The effective mass is a concept used to describe the behavior of electrons in a solid as if they were free particles with a modified mass.
Therefore, without specific details about the material's band structure or dispersion relation, it is not possible to directly calculate the velocity of an electron at the Fermi level based solely on its energy value.