Physics
When a bottle of perfume is opened in one corner of a room the smell spreads soon throughout the room. This is an example of

Surface tension
Diffusion
Capillarity
Viscosity

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Physics
Radiocarbon is produced in the atmosphere as a result of

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

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