Physics
The oil in the wick of lamp rises due to

Low viscosity of oil
Pheonomenon of capillarity
Pressure difference
Force of cohesion

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Physics
Radiocarbon is produced in the atmosphere as a result of

Lightning discharge in atmosphere.
Collision between fast neutrons and nitrogen nuclei present in the 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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