Solid State Physics II - SS3 Physics Past Questions and Answers - page 1

The valence band is completely filled with electrons

The conduction band is completely filled with electrons

The energy gap between valence and conduction bands is fixed and independent of the material

A semiconductor has a larger energy gap than an insulator

The valence band is empty

The conduction band is partially filled

The energy gap between the valence and conduction bands is very small

Semiconductors are metallic in nature

Metals

Semiconductors

Insulators

Superconductors

N-type doping involves adding impurities that create holes in the valence band

P-type doping involves adding impurities that create free electrons in the conduction band

Doping is used to increase the conductivity of semiconductors

Both N-type and P-type doping increase the conductivity of semiconductors

It represents the energy at which the density of states is highest

It is always located in the conduction band

It determines the maximum energy of an electron in a solid

It is a measure of the average energy of the electrons in a solid

Silicon

Glass

Copper

Diamond

Gold

Aluminum

Silicon

Glass

Zero

Small

Intermediate

Large