Explain the formation of energy bands in solids. Distinguish between conductors (metals), insulators and semiconductors on the basis of their energy band diagrams.

Draw a labelled energy band diagram for a solid which is an insulator. What is the main difference between this diagram and that of a semiconductor?

What is meant by doping in semiconductors? What are $p$-type semiconductors?

Explain, how an intrinsic semiconductor can be converted into $n$-type semiconductor. Given one example and draw their energy band diagrams.

What do you understand by $p$- and $n$-type semiconductors? Distinguish between them on the basis of energy band diagram.

Distinguish between intrinsic and extrinsic semiconductors.