How many Nano-meters does EMF travel at?

[Nelli]

If different colours (wave-lengths of light) travel at different speeds (nanometers). At what speed does Electromagnetic radiation travel at?

[incitatus]

you are getting confused. wavelength is measured in nanometers ( or meters ) and varies with colour. They all travel at the same speed (3x10exp8 m/s)

[Nelli]

Sorry Yes you are right, then I suppose what I need to know is what wavelength electromagnetic radiation or what it is?

[Nelli]

Sorry got carried away typing; what colour it is?

[Squirrel]

In order of wavelength, smallest first, the electromagnetic spectrum goes like this:

'�-rays, X-rays, ultraviolet, visible light, infrared, TV, and then various radio waves.

For colours, the only part of the electromagnetic spectrum visible to humans is the ROYGBV part, ranging from violet (about 400nm / 7.5'~10¹⁴Hz) to red (about 760nm / 3.9'~10¹⁴Hz). If you would like to look up the colour of a certain frequency of light, there are loads of web sites that do that. http://www.csun.edu/~hchum001/bookcase/images/spec
trum.gif. Apparently snakes can see part of the infrared section of light - the kind of radiation emitted by all objects as heat - but I don't know how they would describe the colour!

As for what radiation is, I've only just started learning that, but if light is considered to travel as particles, each particle of light has energy hf, where h is the Planck constant 6.63'~10^-34Js and f is the frequency.

I hope this helps.

[Squirrel]

I think I missed out "microwaves" somehwere, and some symbols seem to have been lost. If you see '�, that was meant to be the Greek letter gamma (HTML code 947), and '~ was meant to be the multiplication symbol (code 215).