Physics
The absolute zero is a temperature at which ________

Molecular motion in a gas would cease
Water freezes
All gases become solid
All gases become liquid

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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 solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.

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