At absolute zero, Si acts as Option 1) non-­metal Option 2) metal Option 3) insulator Option 4) none of these

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)

Any semiconductor behaves like an insulator at OK.

So at OK, Si also behaves as an insulator.

Correct option is 3.

Option 1)

non-­metal

This is an incorrect option.

Option 2)

metal

This is an incorrect option.

Option 3)

insulator

This is the correct option.

Option 4)

none of these

This is an incorrect option.

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