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WorksheetsSuperconductors
Total questions: 13
Worksheet time: 11mins
Combination of electron and positive site in BCS theory is called …………...
Phonon
Positron
Neutron
Electron
In the BCS theory ……………… charged lattice is considered
Positive charged
Negative charged
Neutral
None of these
Identify the correct condition in which the absorption of infrared radiation occurs in Superconductors?
hω ≤ 2Δ0
hω ≥ 2Δ0
hω = 2Δ0
Once the absorption of IR radiation happens in Superconductors,the energy gap could be determined by,
wavelength of IR
Frequency of IR
Speed of IR
Energy of IR
In Josephson effect, the static potential results in alternating current
true
false
Choose the correct answer(s)
Josephson frequency includes the ratio of ____________
Charge of the electron to the planck constant
Two times the charge of the electrons to the Planck constant
Two times the Planck constant to the charge of the electron.
Charge of the cooper pair to the planck constant.
In type two superconductors, the surface energy will be negative when,
( here ξ is the coherence length ,λ is the penetration depth)
ξ< λ
λ< ξ
ξ ≥λ
λ>ξ
Coherence length ξ is
1. ξ ∝ ℋc
2. ξ ∝ Tc
3. ξ ∝ 1/Tc
4. ξ ∝ 1/ℋc
Both 3 and 4
Both 1 and 3
Both 2 and 1
Only 2
Far from the Fermi energy, Density of of states for the superconductor is ___________ the normal metal and ___________ near the Fermi energy.
Same, same
Changes greatly, same
Same, changes greatly
Changes greatly, changes greatly
Find the concept?
(type your answer only. Don't include any punctuation marks)
(a)
Can superconducting wire carry great electrical current with no heating?
Yes
No
__________________ is an important factor underlying the nature of high Tc superconductivity.
Electrostatic interaction energy
Dispersion
Electron- lattice interaction
Repulsion
The energy exchange between the electrons and the lattice can be described as ____________________
Radiation and adsorption of phonons.
Absorption of phonons.
Radiation and absorption of phonons.
Radiation of phonons
