Discussion
Consider the following statements regarding a semiconductor :
1. Acceptor level lies close to the valence band.
2. Donor level lies close to the valence band.
3. n-type semiconductor behaves as a conductor at zero Kelvin.
4. p-type semiconductor behaves as an insulator at zero Kelvin. Of these statements :
Answer: C
Statements 1 and 4 are correct, the third option. The acceptor level lies close to the valence band, so that holes are created easily, and at zero kelvin the acceptor levels are unionised and a p-type semiconductor has no free carriers, so it behaves as an insulator.
The donor level lies close to the conduction band and not the valence band, so statement 2 is wrong, and an n-type semiconductor at zero kelvin has no free electrons and also behaves as an insulator, so statement 3 is wrong. So the other options are wrong.
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