A) For opaque solids, \[Eg>1.8eV\]
B) For coloured solids, \[Eg>3.1eV\]
C) For transparent solids, \[Eg>3.1eV\]
D) For semi-conductors, \[Eg>5eV\]
Correct Answer: C
Solution :
| Visible photon energies are from \[1.8\text{ }eV\]to\[2.8\text{ }eV\]. |
| If \[Eg<18\text{ }eV,\]all visible light is absorbed. Also, \[18<Eg<3.1\text{ }eV,\]solid will be coloured. |
| If \[Eg>3.1\text{ }eV,\]solid will be transparent. For \[Eg>3\text{ }eV,\]material is an insulator. |
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