Question

In the bandgap between valence band and conduction band in a material is$5.0eV$, then the material is

• A. Insulator
• B. Semiconductor
• C. Good conductor
• D. Superconductor

Answer 1

The correct option is A

Insulator

Explanation for the correct option

In the case of option A,

1. Insulators, in general, have a large band gap, which prevents electrons from jumping from the valance band to the conduction band.
2. An insulator with a band gap greater than or equal to $5eV$. As a result, the insulator is the best choice.

Explanation for the incorrect option

In the case of option B,

1. Semiconductors are materials that have properties that fall in the middle of the spectrum.
2. Semiconductors are used to make integrated circuits (ICs) as well as electronic discrete components like diodes and transistors.

In the case of option C,

1. Silver $\left(\mathrm{Ag}\right)$, Copper $\left(\mathrm{Cu}\right)$, and Gold $\left(\mathrm{Au}\right)$ are among the best metal conductors $\left(\mathrm{Au}\right)$.
2. A metal's conductivity increases as the number of free electrons increases.

In the case of option D,

1. A superconductor is a substance that achieves superconductivity, which is a state of matter in which there is no electrical resistance and magnetic forces cannot pass through it.
2. In a superconductor, an electric current can last eternally.

Hence the correct option is (A).