All terms in this list:

wavelength: The length of a single cycle of a wave, as measured by the distance between one peak or trough of a wave and the next; it is often designated in physics as λ, and corresponds to the velocity of the wave divided by its frequency.

Brightness: the intensity of color, distinguished by the degree of shading

color: the aspect of any object that my be described in terms of hue, lightness, and saturation.

hue: an attribute of spectrum

electromagnetic radiation: Radiation (quantized as photons) consisting of oscillating electric and magnetic fields oriented perpendicularly to each other, moving through space.