The speed of light. The speed is the same, if the EM waves travel through empty space. In other media, like air or water, they are usually slower.
4 forms
The electromagnetic spectrum.
Yes, all travel at the speed of light.
No, all forms of energy cannot travel in a vacuum. We know that electromagnetic energy (like light or radio waves) can travel in a vacuum. So can gravity waves. But mechanical energy (like sound) cannot.
They are all forms of energy. A part of the electro-magnetic spectrum
Seismic waves are the forms of energy produced by an earthquake.
false
Radio.
The transformation of voltage to a higher potential ensures that energy can travel long distances
Visible light and other waves are part of the electromagnetic spectrum. These waves unlike sound waves can travel through vacuums and do so at c (3x10^8 m/s). The spectrum is very broad and includes microwaves, ultraviolet , x-rays, and our own visible light spectrum. These waves are differentiated based on their frequency but all contain photons, mass-less charge-less particles, hence the dual nature of light (light and other waves behave both as particles and waves, confusing i know :P) basically what this means is that the only difference between visible light, x-rays, and microwaves is the frequency of the photon wave.
It is radiated electromagnetic energy, the only sort that can travel through space.
Seismic Waves