@arteteco @philipp
More or less. Though this isn't quantum mechanics. This is just part of the wave approximation.

Energy is related to wavelength;
E = hν,
so higher energy equates to shorter wavelength. The two aren't *exactly* interchangeable, but they're essentially the same concept.

So, for example, ultraviolet has higher energy/higher frequency (shorter wavelength) than infrared. This is true irrespective of whether you treat photons as waves or particles.