Chinmaya IAS Academy – Current Affairs Chinmaya IAS Academy – Current Affairs
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Context
The decades-long search for a room-temperature and ambient-pressure superconductor has been arduous, spanning technologies, materials, and theories.
LK-99
- It is considered to be a room-temperature superconductor at ambient pressure
- a copper substituted lead apatite
- Independent researchers will have to check
- they can transport electric current with zero resistance
Bring considerable gains for heavy industrial and research applications, including medical diagnostics, mass spectrometers, nuclear reactor designs, and particle colliders
Bardeen – Cooper – Schrieffer theory of superconductivity
The superconducting state of a material will induce four changes in the material.
1: Electronic effect – will transport an electric current with zero resistance.
2: Magnetic effect – A type I superconductor will expel a magnetic field from its body as long as the field strength is below a critical value. This is the Meissner effect.
A type II superconductor won’t expel magnetic fields but will prevent them from moving through its bulk. This phenomenon is called flux pinning.
3: Thermodynamic effect – The electronic specific heat drops drastically at the superconducting transition temperature.
4: Spectroscopic effect – The electrons are forbidden from attaining certain energy levels, even if they could when the material wasn’t a superconductor.
Science And Technology MCQ’s:
- The organisation that became ISRO in 1969 – Ans: Indian National Committee for Space Research (INCOSPAR)
- India’s first satellite launched on its own rocket – Ans: RS-1
- Rocket programme that had only one complete success, in 1994 – Ans: ASLV
- District that hosts ISRO Propulsion Complex – Ans: Tirunelveli
- Instrument onboard AstroSat to study 80-250 keV radiation – Ans: Cadmium-Zinc-Telluride Imagert
