Physics
The velocity of sound in air

Decreases with decrease of temperature
Decreases with increase of temperature
Increases with decrease of temperature
Does not depend on temperature

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

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