No. Light is EM radiation with a wavelength in a particular range (about 400-700nm). There's no difference between light and other EM radiation apart from the wavelength (and frequency), but light is by definition only the stuff we can see with our eyes.finney said:
I think qualifying the particular range of the spectrum as "visible light" instead of just "light", is more descriptive of what one is talking about. As we know, all EM radiation propagates at the speed of light. Calling the visible component just "light" might make one wonder why this particular range of the spectrum is singled out and whether radiation in the other ranges does not propagate at the same speed. It seems that this is the gist of OP's question. Indeed if one googles "EM spectrum/images", one gets variants of this with "visible" instead of "light" in the visible range.Ibix said:
Maybe. I'm still not sure. Perhaps the OP will add some clarity.kuruman said:
As others have said, your question is not clear but as I interpret it, no, the speed of light does not imply what you think it implies. it IS true that the entire EM spectrum is "light" in its most general sense ** and it is true that it all travels at c, but it is NOT true that the speed "c" implies the spectrum, it is a characteristic of the spectrum.finney said:
It may be worth noting that gravitational waves travel at the speed of light in a vacuum (c) but they are not electromagnetic waves.finney said:
A better name would be "the limiting speed of relativity", because the essence of relativity is that there is a limiting speed. That electromagnetic waves in vacuo have this speed of propagation is an empirical fact, i.e., that the em. field is precisely massless. The current upper limit of this "photon mass" is ##10^{-18} \text{eV}##.Hornbein said:
No, the speed of light is the maximum speed at which energy, matter, and information can travel in the universe. It is not possible to travel faster than the speed of light, so time travel is currently considered impossible based on our current understanding of physics.
Yes, according to Einstein's theory of relativity, the speed of light is the ultimate speed limit in the universe. Nothing can travel faster than the speed of light, as it would require infinite energy to do so.
No, the speed of light does not necessarily imply a finite size of the universe. The universe is constantly expanding, and the speed of light is the maximum speed at which information can travel within the universe. However, the universe may still be infinite in size.
Yes, the speed of light is a constant in a vacuum and is the same for all observers regardless of their relative motion. This is one of the fundamental principles of Einstein's theory of relativity.
Yes, the speed of light being a constant in a vacuum is one of the key principles of the theory of relativity, which states that the laws of physics are the same for all observers in all inertial frames of reference. This means that the laws of physics are the same everywhere in the universe, regardless of an observer's location or motion.