Band Theory and Semiconductors

In an insulating material, _______.

• the valence band is filled and the conduction band is empty

• conduction band is filled,

  the valence band is empty.

• both the valence band and conduction band are empty

• both the valence band and conduction band are partially filled

The energy level diagram shown applies to ___.

• A conductor

• An insulator

• A semiconductor

• An isolated molecule

A material with a relatively large gap between its valance band and conduction band would be expected to be ______.

• a good conductor

• easily melted

• a poor conductor

• in the liquid state

According to the band theory of solids, why is lead a good conductor?

• There is a wide energy gap between the valance band and conduction band of lead

• The valance band of lead is empty and the conduction band is filled

• The valance band and the conduction band of lead is half filled.

• The conduction band of lead overlaps the valance band

What is the approximate energy gap between the valance band and conduction band of a semiconductor?

• 0 eV

• 1 eV

• 5 eV

• 10 eV

Which of the following is not a semiconductor?

• Silicon

• Gallium

• Germanium

• Aluminum

A material that conducts electricity well tends to have ______.

• no valance electrons

• partially filled bands

• completely filled bands

• conduction and valance bands that are far apart

_______ is an insulator.

• Copper

• Silicon

• Gold

• Table salt