When a semiconductor is heated, its resistance(A) Decreases (B) Increases(C) Remains unchanged(D) Nothing is definite

When a semiconductor is heated, its resistance typically decreases. This is because an increase in temperature leads to an increase in the number of charge carriers (electrons or holes) that are available for conduction in the semiconductor material. As the number of charge carriers increases, the resistance of the material decreases.

This behavior is due to the intrinsic properties of semiconductors. At lower temperatures, the electrons in the valence band of the semiconductor have less energy to overcome the energy gap and move into the conduction band, where they can contribute to electrical conduction. As the temperature rises, more electrons acquire sufficient energy to move into the conduction band, leading to increased conductivity and lower resistance.

It is important to note that the exact relationship between temperature and resistance can vary depending on the specific semiconductor material and its doping level. However, the general trend is that the resistance of a semiconductor decreases as it is heated.