Practice portal › Semiconductor Electronics › Energy Bands and Classification of Solids
Asked in JEE Main 2006 · Conductors, insulators and semiconductors
Transparent to visible light means the band gap exceeds about 3 eV, so visible photons are not absorbed.
Conductivity rising with temperature is the signature of a semiconductor or insulator, not a metal.
A wide-gap covalent crystal such as diamond fits both.
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