MHT CET 2026 Physics question

Not in JEE Advanced syllabus

In the band structure of n-type semiconductor , the free electrons donated by impurity atoms occupy energy levels in

(A)the conduction band.
(B)the valence band.
(C)the band gap and are close to conduction band.Correct
(D)the band gap and are close to valence band.

Answer: (C)

Solution

In an n-type semiconductor, pentavalent donor impurity atoms contribute extra electrons whose energy levels (donor levels) lie inside the forbidden energy gap, just below the bottom of the conduction band. At low temperature these electrons sit in the donor levels, and a very small thermal energy lifts them into

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Question ID VK-101560