Question

In good conductor, the gap between the valence band and the conduction band is

• A. infinite
• B. large but not infinite
• C. zero
• D. small but not zero

Hint:

In metals the valence band and conduction band overlap, so there is no gap.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
In solids the energy gap \(E_g\) is the separation between the top of the valence band and the bottom of the conduction band.

Step 2: Conductors
In a good conductor (metal) the two bands overlap, so electrons move freely with no extra energy.

Step 3: Comparison
Insulators have a large gap, semiconductors have a small non-zero gap and conductors have none.

Final Answer:
The energy gap in a good conductor is zero. \[ \boxed{\text{(C) }\text{zero}} \]