Physics
Night photography and photopraphy in mist and fog are possible using

Ultra-violet radiation
Microwave radiation
Gamma radiation
Infra-red radiation

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Physics
Acceleration is

Inversely proportional to force
Directly proportional to mass
Inversely proportional to mass
Directly proportional to force

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Physics
Radiocarbon is produced in the atmosphere as a result of

Action of ultraviolet light from the sun on atmospheric oxygen.
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.

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