Question Detail
Question
In which of the following does the valence band overlap with the conduction band.
Correct Answer
Option A is the correct answer.
Detailed Explanation
In solid-state physics, the electronic band structure determines a material's electrical conductivity. In conductors (like metals), the valence band and the conduction band overlap. This means there is no energy gap for electrons to jump, allowing them to move freely and conduct electricity easily. In semiconductors and insulators, there is an energy band gap between the valence and conduction bands.
Hint
Consider the band theory of solids. What characteristic distinguishes conductors from semiconductors and insulators in terms of their energy bands?