![]() The higher the frequency the shorter the wavelength, and vice versa. Visible light has frequencies from 430 to 750 THz. Frequency is the number of times each second electrical and magnetic fields oscillate or reach their maximum strength. Wavelengths of visible light range from 700 to 400 millionths of a millimetre. Wavelength is the distance a wave travels in the time it takes to complete one oscillation. Red light has the longest wavelength and lowest frequency in the visible light spectrum whilst violet light has the shortest wavelength and highest frequency. The other colors (red, orange, and yellow), will produce the least thermal energy because they appear lighter or more like white. The colors of the spectrum appearing the darkest and most like black (violet, indigo, and forest green) will produce the most thermal energy. Black fabric absorbs all colors of light and is therefore warmer than white fabric which reflects all light. The more light a color absorbs, the more thermal energy it produces. ![]() When a color (colored fabric) absorbs light, it turns the light into thermal energy (heat).
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