31. Consider the following statements regarding a semiconductor :
1. Acceptor level lies close to valence band.
2. Donor level lies close to valence band.
3. N-type semiconductor behaves as a conductor at 0°K.
4. P-type semiconductor behaves as an insulator at 0°K.
(a) 1 & 2 are correct
(b) 1 & 3 are correct
(c) 1 & 4 are correct
(d) 2 & 3 are correct
Answer : (c)
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