# The manifestation of band structure in solids is due to Option 1) Heisenberg’s uncertainty principle Option 2) Pauli’s exclusion principle Option 3) Bohr’s correspondence principle Option 4) Boltzmann’s law

As we learnt in

Semiconductor -

Energy gap between valence band and conduction band is less than 3 e.v.

- wherein

1) $\Delta E_^{g}$ lies between conductor & insulator

2) Both electron and holes are responsible for conductivity .

3)    At 0 K behave like an insulator (Si,Ge)

It is due to pauli's exclusion principle: no two electron can have same set of all four quantum number. Hence electron's occupies gradually higher energy level.

Correct option is 2.

Option 1)

Heisenberg’s uncertainty principle

This is an incorrect option.

Option 2)

Pauli’s exclusion principle

This is the correct option.

Option 3)

Bohr’s correspondence principle

This is an incorrect option.

Option 4)

Boltzmann’s law

This is an incorrect option.

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