Answer: 0.1 to 3 eV.
- A 0 eV
- B 0.1 to 3 eV
- C 5 to 10 eV
- D More than 10 eV
Correct answer: B. 0.1 to 3 eV
Explanation: Semiconductors have a band gap of approximately 0.1–3 eV, small enough for thermal or photon energy to promote electrons across.
The three cubic unit cells: Simple Cubic has atoms only at corners; Body-Centred adds one atom at the centre; Face-Centred adds one atom at the centre of each of the 6 faces, giving the highest packing efficiency.
Concept context
Explore the ordered world of crystalline solids: unit cells, packing, defects, and how structure determines electrical and magnetic properties.