I was just wondering because as I understand it, there are different wave lengths of light. Also, if I understand it correctly, "light" is both a wave and a particle (photon). Now, I was a SONAR specialist in the Navy and one of the things we had to learn there was that sound waves propagate/travel at different rates based on their wave length/frequency and the amount of power used to generate them. This is how we were able to determine how far away a sound source was and of course if it was a natural or man made sound. So... since light has different frequencies/wave lengths, wouldn't that mean that light has a speed range rather than just one? Or, when science refers to the speed of light, are they just referring to a single light frequency as well? Thanks.