Which of the following statement is correct_______________?
(A) A semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator
(B) A semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator
(C) A semi-conductor is one which con¬ducts only half of the applied voltage
(D) A semi-conductor is a material made of alternate layers of conducting material and insulator
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