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c) Behaves as an insulator of electricity.
Justification of the response:
3. The holes in a semiconductor behave as:
a) Electrically neutral particles.
b) Negative electrical charges.
c) Positive electrical charges.
d) Protons.
Justification of the response:
4. In the generation process:
a) There appears an electron-hole pair in the semiconductor.
b) There appears a hole and a free electron disappears.
c) There appear more free electrons than holes.
Justification of the response:
5. Explain how a free electron is generated in a semiconductor by doping it with a donor impurity.
6. How is a p-type extrinsic semiconductor obtained?
7. In an extrinsic n-type semiconductor, which are the majority carriers? Why?
8. If we put two donor impurities into a pure [intrinsic] semiconductor, will it still be electrically neutral? Give
reasons for your answer.
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