Physics
Radiocarbon is produced in the atmosphere as a result of

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

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Physics
Pressure Cooker cooks faster because

Boiling point decreases with rise of pressure
The material of the cooker is a good conductor
Higher temperature is attained for cooking
It cooks the food at low pressure

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