JEE Main 2006 Physics question

A solid which is transparent to visible light and whose conductivity increases with temperature is formed by

(1)Metallic binding
(2)Ionic binding
(3)Covalent bindingCorrect
(4)Van der Waals binding

Answer: (3)

Solution

Conductivity increasing with temperature is characteristic of semiconductors/insulators with a band gap; transparency to visible light requires a gap larger than ~3 eV. Such solids (e.g.

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Question ID VK-038784