Physics
Radiocarbon is produced in the atmosphere as a result of

Collision between fast neutrons and nitrogen nuclei present in the atmosphere.
Lightning discharge in atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.
Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.

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Physics
Super conductors are substances that

Conduct electricity at high temperature
Offer high resistance to the flow of electric current
Conduct electricity at low temperature
Offer minimum resistance to flow of electric current

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