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What is the level that acts as a reference which separated the vacant and filled states at 0K?

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What is the level that acts as a reference which separated the vacant and filled states at 0K?

(a) Excited level

(b) Ground level

(c) Valance orbit

(d) Fermi energy level

The question was asked in a job interview.

The doubt is from Free Electron Theory in section Semiconductors of Engineering Physics II

1 Answer

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Right choice is (d) Fermi energy level

Explanation: Fermi energy level is the maximum energy level up to which the electrons can be filled at 0K. Thus it acts as reference level which separated the vacant and filled states at 0K.

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