MHT CET 2024 Physics question

Not in JEE Advanced syllabus

In semiconductors at room temperature,

(A)the valence band is completely filled
(B)the conduction band is completely empty
(C)the condition band is partially filled and the valence band is partially emptyCorrect
(D)the valence band is completely filled and conduction band is partially empty

Answer: (C)

Solution

At absolute zero a semiconductor has a completely filled valence band and a completely empty conduction band. At room temperature (about 300 K) thermal energy lifts a small number of electrons across the small band gap (about 1 eV for Si, 0.7 eV for Ge) into the conduction band. So the conduction band becomes

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Question ID VK-092705