What speed can infrared rays travel?

[johnnyd]

If somebody could be quick and e-mail me an answer as soon as u can because this is for my Physics assignment 4

[andys]

Theoretically anywhere between 0 m/s and 3 x 10^8 m/s (vacuum). Just like visible light certain materials have a high group index and low group velocity for light-waves. In 2001 scientists momentarily stopped a beam of light.

[andys]

Theoretically anywhere between 0 m/s and 3 x 10^8 m/s (vacuum). Just like visible light certain materials have a high group index and low group velocity for light-waves. In 2001 scientists momentarily stopped a beam of light.

[Zau]

at the speed of light

infrared is light right below the frequency of viable light. The frequency doesn't change the wave speed.