Physics
The propagation of sound waves in a gas involves

Isobaric compression and rarefaction
Isochoric compression and rarefaction
Adiabatic compression and rarefaction
Isothermal compression and rarefaction

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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.
Collision between fast neutrons and nitrogen nuclei present in the atmosphere.
Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere.
Lightning discharge in atmosphere.

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Physics
The law of conservation of energy states that

Energy can neither be created or destroyed
Energy can neither be created nor destroyed
Energy can either be created or destroyed
Energy can either be created nor destroyed

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