## What particles can travel faster than the speed of light? Is sound faster or light?

Tachyons are a putative class of particles which able to travel faster than the speed of light. Tachyons were first proposed by physicist Arnold Sommerfeld, and named by Gerald Feinberg. The word tachyon derives from the Greek

There is a theory about a particle called "Tachyon". It is considered that particle moves faster than Speed of light(c) >> Speed of Sound(s)
c(in vacuum)= 3 x 10^8 m/s

s(in air)= 340 m/s
s(in liquid)= 1480 m/s
s(in solid) = 6400 m/s (approx) //Highest speed

Note: Speed of Electromagnetic wave is equal to the speed of light.

All Electromagnetic waves travel at the speed of light in vacuum.Now coming to your question,I think you might have heard some news stating that some particle travels faster than the speed of light.And the name of that particle is Neutrino.In 2011, the OPERA experiment mistakenly observed neutrinos appearing to travel faster than light.This is often termed as Faster-than-light neutrino anomaly. So,No particle travels faster than the speed of light as of now, but one hypothetical particle .

The particle which has created difference of opinion among physicist is Tachyon or tachyonic particle. It is a hypothetical particle which always travels faster than light.Tachyons are a putative class of particles which able to travel faster than the speed of light. Tachyons were first proposed by physicist Arnold Sommerfeld, and named by Gerald Feinberg. The word tachyon derives from a Greek word (tachus), meaning "speedy." Tachyons have the strange properties that, when they lose energy, they gain speed. Consequently, when tachyons gain energy, they slow down. The slowest speed possible for tachyons is the speed of light.

Most physicists believe that faster-than-light particles cannot exist because they inconsistent with the known laws of physics.If such particles did exist, they could be used to build a tachyonic antitelephone and send signals faster than light, which (according to special relativity) would lead to violations of causality.Because a tachyon would always move faster than light, it would not be possible to see it approaching. After a tachyon has passed nearby, we would be able to see two images of it, appearing and departing in opposite directions.A shock wave of Cherenkov radiation, shown only in one moment of time. This double image effect is most prominent for an observer located directly in the path of a superluminal object.

One curious fact is that, unlike ordinary particles, the speed of a tachyon increases as its energy decreases. In particular, Energy approaches zero when velocity approaches infinity. (For ordinary bradyonic matter, Energy increases with increasing speed, becoming arbitrarily large as v approaches c, the speed of light). Therefore, just as bradyons are forbidden to break the light-speed barrier, so too are tachyons forbidden from slowing down to below c, because infinite energy is required to reach the barrier from either above or below.As noted by Einstein, Tolman, and others, special relativity implies that faster-than-light particles, if they existed, could be used to communicate backwards in time.Thus,A possibility of time travel.Amazing isn't .

faster than light neutrino anomaly :Faster-than-light neutrino anomaly - Wikipedia

Tachyonic particle:Tachyon - Wikipedia

You are kidding right? Sound travels at the speed of 740 miles per hour, round about sea level, a few miles per hour faster or slower depending on altitude.

Sound is vastly different to light, it is only possible to generate sound in an atmosphere.

Light is the king, the supreme original energy, it creates particles from itself-there is nothing which exceeds light. Approx 186,000 miles per second - there will be many physics people who will provide even more granular velocity results, but for us peasants - 186,000 miles per second about wraps it up. The speed limit of the universe.

Nothing is faster than the seed of light. Recently scientists thought that "neutrino" particles are faster than light but the theory was soon reject. That's all I know.

Source : Private tutor

Short answer: Light is faster than sound and it is not even close.

Nothing can travel faster than the speed of light (in a vacuum): 299,792,458 m / s

Sound can not travel in a vacuum. The speed of sound in air: 343 m/s.

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