Physics
What happens to a liquid, when the vapour pressure equals the atmospheric pressure?

The liquid boils
The liquid cools
The liquid evaporates
No change

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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 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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