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What is the energy level below which all levels are completely occupied at Zero Kelvin called?

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What is the energy level below which all levels are completely occupied at Zero Kelvin called?

(a) Boson Energy

(b) Fermi Energy

(c) Stable Energy

(d) Ground Energy

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This interesting question is from Classification of Semiconductors in section Semiconductors of Engineering Physics II

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The correct choice is (b) Fermi Energy

To explain: Fermi energy is said to be the energy of the highest possible occupied energy level at 0 K. Below this level, all the states are completely occupied.

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