Different colors of light travel at different speeds in a transparent medium. in a vacuum, different colors of light travel at the same speed.
It's 3 * 10^ 8 m/s, the visible light radiation are electromagnetic waves which do not require a material medium for their propagation and therefore all colors of light travel with the same speed in vacuum.
What is light ?
"Light or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that is perceived by the human eye."
What is speed ?
"Speed is the distance travelled per unit of time. It is how fast an object is moving. Speed is the scalar quantity that is the magnitude of the velocity vector. It doesn't have a direction."
Know more about light here
https://brainly.com/question/15200315
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