Question

Which color of visible light has the most energy per photon - violet or blue?

Answer 1

The thing to remember is that the energy is directly proportional to the frequency via Planck's constant. This means the shorter the wavelength the higher the energy because wavelength and frequency are inversely proportional. Since violet is shorter than blue it has more energy. Ultraviolet would have more energy than visible violet light and gamma rays more than UV.

Answer 2

Thanks so much, ebaxter01! That perfectly answered my question. :)