Intro chem help Visible light spectrum? and energy of photon? help

[nchin]

on a visible spectrum scale what are the numbers for the colors of ROYGBIV? for example is violet 400-500nm and red is 700-800nm? how about the other colors?

If the energy of a photon is 2.63 x 10^-19 J, how can we tell what color this is? i was looking at this electromagnetic spectrum and it doesn't help me much.
http://www.lbl.gov/MicroWorlds/ALSTool/EMSpec/EMSpec2.html

help!

 

[SteamKing]

I don't know where you got your wavelength ranges for the different colors. Here are a couple of different references:

http://en.wikipedia.org/wiki/Visible_spectrum#Spectral_colors
http://www.giangrandi.ch/optics/spectrum/spectrum.shtml

As far as the energy of a photon is concerned, look up Planck's constant.

 

[nchin]

I don't know where you got your wavelength ranges for the different colors. Here are a couple of different references:

http://en.wikipedia.org/wiki/Visible_spectrum#Spectral_colors
http://www.giangrandi.ch/optics/spectrum/spectrum.shtml

As far as the energy of a photon is concerned, look up Planck's constant.

One of my homework ques ask what is the wave length of 755nm and the answer is red.
how is 755nm wavelength = red? the charts shows that red is only up to 700.

 

[Ygggdrasil]

How people refer to color is somewhat subjective. However, I would probably call 755 nm light infrared rather than red.