There are some particles that travel at the speed of light - mainly, the photon (the particle that makes up light), and the (hypothetical) graviton. No particles are known to travel faster than that, and it doesn't seem likely that this is at all possible.
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Photons, or particles of light, travel at the speed of light in a vacuum, which is the fastest speed possible in the universe.
Electromagnetic radiation, such as light and radio waves, travels in a straight line. The fastest particle currently known is the neutrino, a subatomic particle with almost no mass and no electric charge.
Sound travels fastest in solids because the particles in solids are closest together, allowing vibrations to pass quickly from one particle to the next.
Sound travels fastest through solid materials because the particles are tightly packed, allowing the vibrations to pass quickly through the medium. Examples of solid materials where sound travels fastest include metals like steel and iron.
sound travels fastest in solid (about 8x faster)
Sound travels through different mediums by creating vibrations that are transmitted from one particle to another. In solids, such as metal or wood, sound travels fastest because the particles are closely packed together. In liquids, like water, sound travels slower because the particles are more spread out. In gases, such as air, sound travels slowest because the particles are far apart.