Which rays caused the dissociation of water i | vedclass

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(A) In the early atmosphere of Earth,there was no ozone layer to block solar radiation. High-energy $UV$ rays from the sun reached the Earth's surface

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$UV$ rays

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(A) In the early atmosphere of Earth,there was no ozone layer to block solar radiation. High-energy $UV$ rays from the sun reached the Earth's surface and caused the photolysis (dissociation) of water vapor $(H_2O)$ into hydrogen $(H_2)$ and oxygen $(O_2)$. The lighter hydrogen gas escaped into space,while the oxygen combined with other elements like ammonia and methane to form water,carbon dioxide,and other compounds.

Which rays caused the dissociation of water into hydrogen and oxygen during the early stages of Earth's atmosphere?

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