Red and orange are violent colors  at the end of the visible spectrum of light,
They are at the end of the spectrum. I find it interesting to think of whats beyond the visible spectrum. Did you know some insects can see beyond violet?
yes, Colors can be measured and quantified in various ways
Have you learned about the physics of light in school? 
No, but I know due to biology different people see the same illuminated object or light source in different ways.
Did you know most people think that dogs only see black and white, but they also see some shades of blue and yellow.
Cool, with blue, It lies between violet and green