MHT CET 2024 Physics question

Not in JEE Advanced syllabus

When a small amount of impurity atoms are added to semiconductor, then generally its resistivity

(A)may increase or decrease depending upon the percentage of doping.
(B)increases.
(C)decreases.Correct
(D)does not change.

Answer: (C)

Solution

Adding a small amount of a trivalent or pentavalent impurity (doping) creates many additional free charge carriers (extra electrons in n-type, holes in p-type) compared with the very few thermally generated carriers of the intrinsic semiconductor. Conductivity therefore

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Question ID VK-099652