Pure silicon is an insulator. Silicon doped with phosphorus is a semiconductor. Silicon doped with gallium is also a semiconductor. What is the difference between the two doped semiconductors?

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Silicon doped with electron-rich impurity forms .................

(a) P-type semiconductor (b) n-type semiconductor

Which of the following statements are true about semiconductors ?

(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

(d) An electron vacancy increases the conductivity of n-type semiconductor

C d C l_{2}

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