CBSE 2022 · Region 3 · Set 2 · Q8 · 3 marks
Draw the energy band diagrams for conductors, semiconductors and insulators. Which band determines the electrical conductivity of a solid ? How is the electrical conductivity of a semiconductor affected with rise in its temperature ? Explain.
Marking-scheme solution
Conduction band determines electrical conductivity
As temperature of a semiconductor rises, the carrier concentration (electron-hole pair ) increases due to breaking of covalent bonds and the conductivity of the semiconductor increases.Semiconductor Electronics: Materials, Devices and Simple CircuitsClassification of Metals, Conductors and SemiconductorsUnderstandshort_answermedium
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CBSE Class 12 Physics past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.