Light and heat are both forms of energy, and conversions from one form of energy to another are not uncommon in the natural world. Light is essentially energy in motion, whereas heat is energy created by the motion of atoms or molecules. Since atoms are always in motion, at least a little heat is always being produced, but when waves of light hit atoms or molecule, the energy from the light excites them and they become more active. This increase in motion in turn increases the amount of heat produced.
The transformation from light energy to heat energy occurs with a “radiationless transition.” This is when an atom vibrates so much that it moves from “electronically excited” to “vibrationally excited,” meaning that the entire atom itself is moving.
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