Electrical Engineering XYZ MCQs
The forbidden energy gap between valance band and conduction band in semiconductor material is about:
- 0 eV
- 15 eV
- 1 eV
- None of the above
Correct answer: 3. 1 eV
Explanation: In semiconductor materials, the forbidden energy gap, also known as the bandgap, is the energy difference between the valence band (the highest energy band filled with electrons) and the conduction band (the next higher energy band, typically empty at absolute zero temperature). This gap determines the conductivity behavior of the semiconductor.
The energy gap is usually measured in electron volts (eV). In most semiconductor materials, this energy gap falls in the range of about 0.1 eV to 3 eV. For common semiconductors like silicon, germanium, and gallium arsenide, the energy gap is around 1 eV (electron volts), hence the correct option is “1 eV”.
Option “None of the above” is not correct because there is a well-established energy range for the bandgap in semiconductor materials, and it typically falls within the mentioned range.