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

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Physics
Dynamo is a device for converting

Chemical energy into electrical energy
Magnetic energy into electrical energy
Heat energy into electrical energy
Mechanical energy into electrical energy

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