MHT CET 2023 Physics question

Not in JEE Advanced syllabus

A pure Si crystal has 4 x 10 atoms per m. It is doped by 1 ppm concentration of antimony. The number of free electronics available will be

(A)4 x 10 m
(B)4 x 10 m
(C)4 x 10 mCorrect
(D)4 x 10 m

Answer: (C)

Solution

1 ppm means one dopant atom per atoms of silicon. Number of antimony atoms per m . Antimony is a pentavalent (Group 15) donor: each atom contributes one free electron, and the

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Question ID VK-095114