AExE01 · Chapter 1Basic Electrical & Electronics🏛️ Past Licensure QuestionID: 97ebb0d2
Which type of material possesses the largest forbidden energy band gap between its valence and conduction bands?
Which type of material possesses the largest forbidden energy band gap between its valence and conduction bands?
Multiple Choice Options
- A
Conductor
- B✓ Correct Option
Insulator
- C
Semiconductor
- D
Superconductor
Detailed Technical Solution & Explanation
The forbidden energy band gap () between the valence band and conduction band is: zero (or overlapping) in conductors (metals), moderate () in semiconductors (e.g., Silicon: 1.1 eV, Germanium: 0.67 eV), and very large ( to ) in electrical insulators (e.g., diamond: 5.5 eV, quartz: ~9 eV).
Option Analysis:
•
Option A (Conductor): Incorrect. Overlapping valence and conduction bands ().
•
Option B (Insulator): Correct. Insulators have the largest forbidden band gap ().
•
Option C (Semiconductor): Incorrect. Narrow band gap (~1 eV).
•
Option D (Superconductor): Incorrect. Zero electrical resistance at cryogenic temperatures.
Reference: Demo2 · Set 2NEC Licensure Syllabus