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Red light (R) has the lowest frequency of the visible spectrum. Blue Light (B) has the highest frequency. White light is the combination of all the frequencies of light. The color something reflects is the color you see. So, if you wear a black shirt on a hot day, you'd absorb all the frequencies of light (every color). According to the first law of thermodynamics, energy can neither be created nor destroyed. So when light hits an object, the energy has to go somewhere. Energy can change forms. So the light energy changes into heat energy, heating the air molecules in the Earth's atmosphere and heating the surface of whatever the color is on, like your shirt. How hot the colored surface gets depends on what color it is because that describes what frequency(s) light it absorbs.
No doubt most of us have heard that objects that are black or other dark colors are more absorbent and white and light objects are more reflective, but letâs start out by clarifying just whatâs being absorbed and reflected. Itâs not heat, but another form of energy: light. Heat comes into play a little bit later.