1.

Which of the following statements are ture about semi-conductors ?

Answer»

Silicon doped with ELECTRON rich impurity is a p-type semi-conductor
Silicon doped with an electron rich impurity is an n-type semi-conductor
Delocalised electrons increase the conductivity of doped silicon
An electron vacancy increases the conductivity of a-type semi-conductor.

Solution :(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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