At room temperature, a conductor has how many holes?
Right Answer is:
At room temperature, a conductor has NO holes.
In a conductor the conduction band and the valence band overlap each other as shown in the figure so that the electrons can readily pass into the conduction band, i.e., the electrons can readily move under the influence of the applied field. For conductors, the energy gap is of the order of 0.01 eV.
In metal, there is just a conduction band that is filled to some level with electrons, allowing current to flow freely. Some of the electrons may be thermally excited and thus leave some lower energy level unoccupied, but that doesn’t really contribute to the conductivity properties. So at room temperature, a conductor has NO holes.