Rough surfaces , dark in colour.
yes- red has the longest waves while violet has the shortest.
the colour is white
it causes surfaces to which applied to change colour
All the combinations of visible colour are included in the visible spectrum.
Colour only applies to visible light. UV rays are not visible.
Red color in the visible spectrum has longest wavelength.
Different amounts of energy contained in different frequencies cause different colours to be perceived by us. It's all in the spectrum of visible light.