Physics
In superconductors, the energy gap is due to

Electron-phonon interaction
Phonon-phonon interaction
Electron-electron interaction
Electron-photon intercation

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Physics
Superconductors are those elements

Which conduct electricity only at super-high temperatures
Which turn into insulators at very low temperatures
Whose conductivity is intermediate between metals and insulators
Whose resistance falls almost to zero at very low temperatures

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