Which of the following statements are true about semiconductors? (A...

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Which of the following statements are true about semiconductors?
(A) Silicon doped with electron rich impurity is a p-type semiconductor.
\( \mathrm{P} \)
(B) Silicon doped with an electron rich impurity is an \( \mathrm{n} \)-type semiconductor.
W
(C) Delocalised electrons increase the conductivity of doped silicon.
(D) An electron vacancy increases the conductivity of \( n \)-type semiconductor.
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