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

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Physics
Which of the following is not a property of heavy water ?

It produces corrosion
Boiling point of heavy water is lower than that or ordinary water
Freezing point of heavy water is higher than that of ordinary water
Density of heavy water is higher than that of ordinary water

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