Which, if any, of the following is/are reasons that a material is a good electri

Question

Which, if any, of the following is/are reasons that a material is a good electrical conductor?

The Fermi energy is in the middle of an energy gap that is more than 3 eV wide.

Because there are no gaps in the energy bands of the material

There is an energy gap between the valence band and the conduction band, but it is only a few eV wide.

There is an energy band gap, but the Fermi energy is well within an unfilled energy band.

There is a small (~1 eV ) energy gap between the filled valence band and the next higher band where electrons can exist.

None of the above statements are true.

Explanation / Answer

Because there are no gaps in the energy bands of the material is the true statement as the valence and conduction band in a good conductor overlap each other

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