NEET 2011 Physics question

Not in JEE Advanced syllabus

If a small amount of antimony is added to germanium crystal :

(1)It becomes a p-type semiconductor
(2)the antimony becomes an acceptor atom
(3)there will be more free electrons than holes in the semiconductorCorrect
(4)its resistance is increased

Answer: (3)

Solution

Antimony (Sb) is pentavalent (group 15). When added as an impurity to tetravalent germanium, four of its electrons form covalent bonds and the fifth becomes a free electron, so Sb is a donor atom and the crystal becomes

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Question ID VK-090974