Question

The energy gap in glass at room temperature is :

• A. greater than that in a semiconductor
• B. less than that in a good conductor
• C. greater than that in a good conductor
• D. both (A) and (C) are true

Answer 1

The correct option is D both (A) and (C) are true

Glass is an insulator. The energy gap of an insulator is $\sim 6eV$. Whereas for conductors, the energy gap is $\sim 0eV$.
for semiconductors, energy gap $\sim 3eV$.
So energy gap for glass is greater in conductors or a semiconductor.