Physics
Which one of the following reflects back more sunlight as compared to other three?

Sand desert
Land covered with fresh snow
Prairie land
Paddy crop land

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Physics
Radiocarbon is produced in the atmosphere as a result of

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.
Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.

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