What color light has the highest frequency?
Violet waves have the most energy of the visible spectrum.
As wavelength decreases, frequency increases and, as
Red waves have a relatively long wavelength (in the 700 nm range), and violet waves are much shorter - roughly half that.
Because violet waves have the shortest wavelength of the visible light spectrum, they carry the most energy.
I remember it as the highest frequency indicating the highest energy. The higher the frequency, the faster the oscillations and thus the higher the energy. Therefore, the highest-frequency ultra-violet light (or the lowest wavelength) is violet. However, the highest-frequency visible light would have to be roughly blue.