Energy Gap and Density of States

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Multiple Choice

What is the energy gap in a superconductor?

  1. The energy difference between the ground state and the first excited state
  2. The energy difference between the superconducting state and the normal state
  3. The energy difference between the Fermi level and the bottom of the conduction band
  4. The energy difference between the top of the valence band and the bottom of the conduction band
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