Question

The forbidden energy gap in conductors is approximately:

• A. \(0\,eV\)
• B. \(1\,eV\)
• C. \(5\,eV\)
• D. \(10\,eV\)

Hint:

Smaller band gap means easier movement of electrons and higher conductivity.

Answer 1

The Correct Option is A

Concept: In solids:

• Conductors have overlapping valence and conduction bands.
• Semiconductors have small band gap.
• Insulators have large band gap.

Step 1: Understand conductors. In conductors: \[ E_g \approx 0 \] Valence band and conduction band overlap. Hence electrons move freely.

Step 2: Compare with semiconductors and insulators.

• Semiconductor: \[ E_g\approx1\,eV \]
• Insulator: \[ E_g>5\,eV \]

Thus conductor has negligible forbidden gap.

Step 3: Final answer. \[ \boxed{ 0\,eV } \]