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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.
Rating Newest Oldest. Best Answer: The cooler the color, the cooler the temperature. Blue is not as cold as violet, which should read as the coolest temperature on a thermal camera. Green is warmer than blue, and yellow is warmer than green. For reference, here's a color spectrum: http://www.bwayweb.com/design/i/color_spectrum.jpg. To the left are the warmest colors which would correspond to the warmest objects registering on the thermal camera, and to the right are the cooler colors which correspond to cooler objects on the thermal camera.