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Which of the following statements are ture about semi-conductors ?A. Silicon doped with electron rich impurity is a p-type semi-conductorB. Silicon doped with an electron rich impurity is an n-type semi-conductorC. Delocalised electrons increase the conductivity of doped siliconD. An electron vacancy increases the conductivity of a-type semi-conductor.

Answer» Correct Answer - C
(b,c) are corrcet statements.
(a) Silicon doped with electron rich impurity is an n-type semiconductor. Therefore, staement (a) is false. ltbRgt (b) The conductivity of n-type semi-conductors increases due to extraelectrons and not because of electron valency. Therefore statement (b) is false.


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