First slide

Classification of semi-conductors

Question

A P-type semiconductor is formed when
A . As impurity is mixed in Si
B. Al impurity is mixed in Si
C. B impurity is mixed in Ge
D. P impurity is mixed in Ge

Easy

A

A and C
B

A and D
C

B and C
D

B and D

Solution

Boron and aluminium are trivalent impurities.

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