Answer: 180°.
- A 0°
- B 90°
- C 180°
- D 360°
Correct answer: C. 180°
Explanation: A common-emitter amplifier inverts the signal, giving a 180° phase difference.
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.