Question

silicon doped with electron rich impurity forms ………. .
A. p-type semicondutor
B. n-type semiconductor
C. intrinsic semiconductor
D. insulator

Answer 1

Correct Answer - B
When Si is doped with an eletron rich impurity, the resulting crystal have an extra electron, which makes the crystal conducting. Since an electron (Negative charge ) is responsible for the conductivity of crystal, it is called n-type semiconductor.