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Identify the correct answer on Fermi temperature.

a. Usually, Fermi temperature is much higher than room temperature. Reason is: electrons are fermions and obeys Pauli exclusion principle. As electrons cannot occupy the same state, they are forced to occupy higher energy states resulting in high Fermi energy and high Fermi temperature.

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b. Fermi temperature is the temperature where phonon contribution plays an dominating role in materials' electrical and thermal conductivity. So this can be closer to room temperature.

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c. Fermi temperature is an intrinsic property of the material this can have a very low value or upto room temperature depending on material's defect states, valency etc.

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d. Usually, Fermi temperature is very low compared to the room temperature. This is because, at Fermi temperature, phonon contribution to the electrical and thermal conductivity must be very low.

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SOLID STATE PHYSICS - I

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