What makes blue light different from red light?

Answer 1

The visible spectrum (or sometimes optical spectrum) is the portion of the electromagnetic spectrum that is visible to (can be detected by) the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. There are no exact bounds to the visible spectrum; a typical human eye will respond to wavelengths from 400 to 700 nm, although some people may be able to perceive wavelengths from 380 to 780 nm. In terms of frequency, this corresponds to a band in the vicinity of 500 terahertz. A light-adapted eye typically has its maximum sensitivity at around 555 nm, in the green region of the optical spectrum. The spectrum does not, however, contain all the colors that the human eyes and brain can distinguish. Brown, pink, and magenta are absent

Wavelengths visible to the eye also pass through the "optical window", the region of the electromagnetic spectrum which passes largely unattenuated through the Earth's atmosphere (although blue light is scattered more than red light, which is the reason the sky is blue).


violet 380–450 nm
blue 450–495 nm
green 495–570 nm
yellow 570–590 nm
orange 590–620 nm
red 620–750 nm

Answer 2

The difference is in the wave length of the light wave which is longer for the red light or alternatively considering the frequency the red light has a lower frequency than the blue light which also means that the energy of blue light is higher.

Answer 3

Blue light waves are shorter and more energetic than red light waves.

Answer 4

Because of their wave length/frequency.

Answer 5

Do you mean other than the color, or are you asking what makes the color itself different?

Answer 6

It depends if you're in K-mart or not.....lol!