The Meissner effect in a superconductor makes the superconductor a perfect param

Question

The Meissner effect in a superconductor makes the superconductor a perfect paramagnet below the critical field level. is lost higher than the Curie temperature. can remain even after the temperature goes above the transition temperature. is independent of the zero property of a superconductor. generates currents to counteract magnetic flux. Use the band theory of semiconductors to choose the most correct statement below. Materials that are generally called conductors contain an overlap in the conduction and valence bands. Electrons in insulators at room temperature can easily cross the band gaps. A semiconductor primarily differs from an insulator in size of band gap. Semimetal materials are arranged structurally like metals but act as insulators because they have large band gaps. Conductors and semimetals are similar in band structure because of large band gaps. The Kronig-Penney model for electrons within a semiconductor utilizes all of these quantum mechanical constructs EXCEPT: tunneling discrete electron energy levels (within the lattice spaces) finite potential wells boundary conditions wave functions The BCS theory of superconductivity details the working of a superconductor. Choose the statement below that describes one of its characteristics. The repulsion of electrons in pairs is significantly reduced by the extremely low temperatures of superconductor operation, making electron pairing possible. Single electrons are responsible for establishing currents in the superconductor. Currents flow without resistance until the lattice begins to vibrate. The resistance decreases in proportion to the lattice vibrations, which in turn decrease with decreasing temperature. A pair of electrons becomes like a boson and transitions to a ground state with other electron pairs.

Explanation / Answer

1. Meissner effect is lost at higher than Curie temperature.

2. In conductors there isa overlap in valance and conduction bands.

3. Kronig-Penny model does not utilize the concept of tunneling.

4. BCS theory tells us that, a pair of electrons act as a boson.

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