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Radiocarbon is produced in the atmosphere as a result of

1. collision between fast neutrons and nitrogen nuclei present in the atmosphere
2. action of ultraviolet light from the sun on atmospheric oxygen
3. action of solar radiations, particularly cosmic rays, on carbon dioxide present in the atmosphere
4. lightning discharge in atmosphere

Correct answer: collision between fast neutrons and nitrogen nuclei present in the atmosphere

Solution

Radiocarbon (C) is formed when fast neutrons produced by cosmic rays collide with nitrogen nuclei in the atmosphere. This converts nitrogen into carbon-14. It is the basis of radiocarbon dating.

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