Question Detail
Question
The energy band in which free electrons exist is:
Correct Answer
Option C is the correct answer.
Detailed Explanation
In materials, the valence band contains electrons that are tightly bound to atoms. Electrons that gain enough energy to move to the conduction band become free to move and contribute to electrical current. Therefore, free electrons exist in the conduction band.
Hint
Think about where electrons are mobile and can conduct electricity.