Physics
The velocity of sound in moist air is more than in dry air because the moist air has

Less pressure than dry air.
More pressure than dry air.
More density than dry air.
Less density than dry air.

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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.
Lightning discharge in atmosphere.
Action of ultraviolet light from the sun on atmospheric oxygen.

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