Physics
Man perceives sound vibrations in the frequency ranges of

0 – 5 Hz
20 – 20000 Hz
11 – 20 Hz
6 – 10 Hz

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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.
Collision between fast neutrons and nitrogen nuclei present in the atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.
Lightning discharge in atmosphere.

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