What color of light has the longest wave length? The shortest?

I believe red is the shortest and blue is the longest.

Reverse that, Yafa. And violet is actually slightly shorter than blue.

Methos is, as expected, right. Most of us have experienced the longest wave length waiting for it to turn green at a stop light.

"Light is a form of energy that can be thought of as consisting of waves. The experimental evidence is that red light differs from blue light only in wave length. Red light has the longest wave length in the visible spectrum; violet, the shortest." - Tutorials/prism_spectroscope.