If pentavalent impurity is mixed in a crystal lattice of germanium, the semiconductor will be
(1) p-type
(2) n-type
(3) pnp
(4) npn


Answer: Option 2
Explanation: If a pentavalent impurity is mixed into a crystal lattice of germanium, the semiconductor will be n-type.
In n-type semiconductors, the pentavalent impurity introduces extra electrons into the crystal lattice. In the case of germanium, the pentavalent impurity, such as arsenic or antimony, has one extra valence electron compared to germanium’s four valence electrons. This extra electron becomes a mobile charge carrier, contributing to the conduction of electricity.
Therefore, the correct answer is (2) n-type.


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