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Q.

Which of the following statements are true about semi conductors?

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a

Silicon doped with electron rich impurity is a p-type semiconductor.

b

Silicon doped with an electron rich impurity is an n-type semiconductor

c

Delocalized electrons increase the conductivity of doped silicon

d

An electron vacancy increases the conductivity of n-type semiconductor

answer is B.

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Detailed Solution

Silicon doped with an electron rich impurity is a n type semiconductor. Conductivity of n-type semiconductor is due to the presence of free electron. Delocalization of electrons increases the conductivity of doped silicon due to increase in mobility of electron.
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