Question

Which of the following statements is correct regarding Semiconductor Physics?

• A. N-type semiconductor has a majority of holes.
• B. To convert a pure semiconductor into a P-type semiconductor, Phosphorus is used as a dopant.
• C. In the energy band diagram of a metal, the forbidden band is absent.
• D. The resistance of a semiconductor increases with increasing temperature.

Answer 1

Answer:

C. In the energy band diagram of a metal, the forbidden band is absent.

In the energy band diagram of a metal, the forbidden band is absent or very small.

In metals, the valence band and conduction band overlap, allowing electrons to flow freely. This overlap means that there is no significant energy gap or forbidden band between the valence and conduction bands.

In contrast, semiconductors have a small energy gap (forbidden band) between the valence and conduction bands, which can be bridged with external energy. Insulators have a large energy gap.