Question

The energy gap between the top of the valence band and bottom of the conduction band is called the energy band gap \((E_g)\). Depending upon the materials, the gap can be:

• A. Positive
• B. Negative
• C. Zero
• D. Positive,Negative,Zero

Hint:

The energy gap is a critical property distinguishing conductors, semiconductors, and insulators. Understand material-specific characteristics for Eg.

Answer 1

The Correct Option is D

The energy band gap ($E_g$) varies depending on the material:
 For insulators, $E_g$ is positive and large.
   For semiconductors, $E_g$ is positive and small.
   For conductors, $E_g$ can be effectively zero or negative, as the valence and conduction bands overlap.