Draw separate energy-level bands for conductors, semiconductors and insulators and label each of them to illustrate the behaviour of a conductor.

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.