Across the electromagnetic spectrum, there is quite a correlation between color, wavelength, and energy. To put it simply, as the energy becomes greater, the frequency becomes becomes greater, and thus creates a shorter wavelength. With the presented correlation amongst wavelength and frequency (higher frequency=shorter wavelength), it can be concluded that shorter wavelengths are progressively more energetic in comparison to long wavelengths. In the graph below, you can see a visual representation of the long wavelength in comparison to the shorter wavelength.
This is a mathematical relationship between frequency and wavelength.
All this ties in with color, as the further along the visible light spectrum you go, the more energy is required in order to produce certain colors.
In the graph to the left, one can see exactly what this means. Our visible light spectrum spans from what we call red, to a color we call violet. Colors are not random placements, the 7 colors (red, orange, yellow, green, blue, indigo, violet) in our spectrum are always in the same order; this can be seen in nature such as rainbows, they are always in this order of color. As you can see, the color red takes the lowest frequency and longest wavelength to produce, meaning not a lot of energy is required. As you go down the spectrum, the frequency becomes higher and the wavelength becomes shorter, hence violet requires the highest frequency and wavelength. |