Answer: 1.1 eV.
- A 0.72 eV
- B 1.1 eV
- C 1.43 eV
- D 3.4 eV
Correct answer: B. 1.1 eV
Explanation: Silicon: Eg = 1.1 eV. Germanium: 0.72 eV. GaAs: 1.43 eV. Wider gap = less conduction at room temperature.
Conductors have overlapping bands, semiconductors have a small energy gap that can be bridged by heat or doping, and insulators have a large gap that blocks conduction.
Concept context
Band theory, p-n junction, diodes, transistors, logic gates, and integrated circuits.