Final answer:
Violet light carries the most energy per photon in the visible spectrum due to its shortest wavelength and highest frequency, which corresponds to higher photon energy.
Step-by-step explanation:
The color of light that carries the most energy per photon is violet. In the visible spectrum, violet light has the shortest wavelength, which corresponds to the highest frequency and, therefore, the highest energy according to the relationship E = hf, where E is energy, h is Planck's constant, and f is frequency. Colors with shorter wavelengths—like violet—have more energy per photon compared to colors with longer wavelengths, such as red, green, or blue. This is also why violet light can cause more damage to biological tissues and was found to be more effective for photographic emulsions, as it contains a greater amount of energy.