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Band gap in a semiconductor is of the order

1. 6 eV
2. 0.60 eV
3. 60 eV
4. 0 eV

Correct answer: 0.60 eV

Solution

Semiconductors have a band gap that is small enough for some electrons to be thermally excited across it at ordinary temperatures. A value around 0.6 eV is typical, whereas 0 eV corresponds to metals and several eV is more like an insulator.

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