Physics
The density of a gas is maximum at

High temperature, high pressure
High temperature, low pressure
Low temperature, high pressure
Low temperature, low pressure

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Physics
Radiocarbon is produced in the atmosphere as a result of

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

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