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can light travel faster than light

can light travel faster than light插图


Will we ever travel faster then light?

The fact is we’ll never be able to travel beyond the speed of light, at least based on our current understanding of established physics. As any object with mass accelerates – like a proton in the LHC – it gains energy, always needing just a little bit more energy to accelerate even further.

Is there any thing that travels faster than light?

We all know the number one traffic rule of the universe – nothing can travel faster than the speed of light. And that happens to be 299,792.458 kilometres per second. But why is it so? Before the 1600s most people assumed light moved instantaneously. Galileo was among the first to think that light travelled at a finite speed.

Can anything in the universe travel faster than light?

Over and over (and over and over) we’re told the supreme iron law of the universe: Nothing — absolutely nothing — can go faster than the speed of light. Done. Nothing further needs to be said about the issue. And then come the astronomers, always excited by the chance to mess up your comfort zone.

What would happen if we travel faster than light?

Warped Physics: 10 Effects of Faster-Than-Light TravelPhysics Undone. A new image from NASA’s Chandra X-ray Observatory and Spitzer Space Telescope shows the dusty remains of a collapsed star.Special Relativity. Here a drawing of Albert Einstein. …Time Travel. …Cause and Effect. …E=mc^2. …The Standard Model. …String Theory. …Neutrinos. …Tachyons. …Supernova 1987A. …More items…

What is the relationship between velocity and velocity?

Here a three-dimensional (right) graph shows the relationship between three different velocities: v, u and U, where v is the velocity of a second observer measured by a first observer, u is the velocity of a moving particle measured by the second observer, and U is the relative velocity of the particle to the first observer. (Image credit: Hill, Cox/Proceedings of the Royal Society A)

What does Hill and Cox’s equation mean?

Hill and Cox’s equations suggest, for example, that as a spaceship traveling at super-light speeds accelerated faster and faster, it would lose more and more mass, until at infinite velocity, its mass became zero. "It’s very suggestive that the whole game is different once you go faster than light," Hill said.

How long does it take for a spaceship to travel to another planet?

Thus, the crew of a speeding spaceship might perceive their trip to another planet to take two weeks, while people left behind on Earth would observe their passage taking 20 years.

What is the singularity of the universe?

In effect, the singularity divides the universe into two: a world where everything moves slower than the speed of light, and a world where everything moves faster. The laws of physics in these two realms could turn out to be quite different.

When was the first person to travel faster than sound?

Before Chuck Yeager became the first person to travel faster than the speed of sound in 1947, many experts questioned whether it could be done. Scientists worried that the plane would disintegrate, or the human body wouldn’t survive. Neither turned out to be true.

Which theory of relativity is based on a description of velocities that exceed the speed of light?

Despite an apparent prohibition on such travel by Einstein’ s theory of special relativity, the scientists said the theory actually lends itself easily to a description of velocities that exceed the speed of light.

When was special relativity first proposed?

3 in the journal Proceedings of the Royal Society A: Mathematical and Physical Sciences. Special relativity, proposed by Albert Einstein in 1905 , showed how concepts like speed are all relative: A moving observer will measure the speed of an object to be different than a stationary observer will.

Does light always have the same speed?

Light always has the same speed. If you would point a flashlight to the east (direction of the earths spin) a person on the sun may say your light is traveling faster than the speed of light, yet it is relative to the earth.#N#Something more interesting, if a plane would fly at about 99.999999999999999999% of the speed of light, and one would run to the nose of the plain would that person exceed the speed of light? No, time would be slowed down drastically in order to keep anyone/ anything from exceeding the speed of light. This is not theoretical, this is experimentally shown in the LHC using very short lived molecules, these molecules lasted a lot longer at near the speed of light (don’t know exactly how long but it was thousands of times).

Can we create energy from the vacuum?

I can assure you there is. It’s a well-known fact.#N#The classical theory states no energy can be created. But we can create energy from the vacuum, from virtual to real.#N#It stands to reason this is a violation of the classical sense.

Does the speed of light stay the same?

No, the speed of light will be the same, whatever frame of reference :)#N#The reason : when you say that “If you fire a gun sitting in an airplane, the bullet’s velocity will be speed of plane plus the the velocity due to the gun.” you simply add the two velocities (the one from the plane plus the one from the bullet). This law (adding the two velocities) is only an approximation when the velocities are small wrt the speed of light; it is incorrect when you have to deal with near-speed-of-light velocities.#N#When you use the correct composition of velocities law, you see that the speed of light stays the same whatever frame of reference 🙂

What happened to the light pulse when Fizeau turned the wheel faster?

What happened? At slow speeds, the light pulse always got back to Fizeau through the same gap in the cog’s teeth. But as Fizeau turned the wheel faster, at a certain speed the pulse was blocked by the following tooth. Knowing the rotational speed, Fizaeau thus could calculate how long it took for light to travel 16 kilometres – and so how fast the light must be travelling. His remarkable result of 315,000 km/s was within about 5% of our most recent measurements using lasers.

How did R?mer explain his observations?

Römer realised his observations could be explained by the varying distance between Jupiter and Io, and Earth. The different times for Io’s orbit reflected the different distances light had to travel. It also allowed Römer to estimate the speed of light as 214,000 km/s. Not bad!

How did Galileo measure the time of the flash?

In 1638 he tried to measure it. He and an assistant perched themselves on distant mountaintops with covered lanterns. The idea was that as soon as Galileo’s assistant saw the flash, he uncovered his lantern. Galileo would then time how long it took to see the return flash. The experiment failed dismally! To succeed, Galileo would have had to register a time difference of microseconds. He had no such time keeping device and his reaction time would be way slower than that.

How fast can nothing travel?

We all know the number one traffic rule of the universe – nothing can travel faster than the speed of light. And that happens to be 299,792.458 kilometres per second. But why is it so?

Who was the first person to measure the speed of light?

The first experimental measurement of the speed of light came 150 years later with Hippolye Fizeau . He came up with an ingenious advance on Galileo’s method. In his experiment, a beam of light was projected onto a rapidly rotating cog-wheel. The teeth of the rotating cog chop the light up into very short pulses. These pulses travelled about 8 kilometres to where Fizeau had positioned a carefully aligned mirror. On the return trip, the reflected light pulse could only reach Fizeau by passing back through one of the gaps in the cog-wheel.

Who discovered that electrons are heavier and heavier?

In 1964, Bill Bertozzi at MIT accelerated electrons to a range of speeds. He then measured their kinetic energy and found that as their speeds approached the speed of light, the electrons became heavier and heavier – until the point they became so heavy it was impossible to make them go any faster. The maximum speed he could get the electrons to travel before they became too heavy to accelerate further? The speed of light.

Who said light is not instantaneous but is extraordinarily rapid?

Undaunted, Galileo concluded that light’s movement, “if not instantaneous, is extraordinarily rapid”.

What happens when you accelerate a particle to the speed of light?

Therefore, when you try to accelerate a particle nearly to the speed of light, it takes more and more energy to do it. Actually accelerating to the speed of light itself would take an infinite amount of energy, which is impossible.

Why are tachyons removed?

Such particles, called tachyons, have shown up in some theoretical models, but they almost always end up being removed because they represent a fundamental instability in the model. To date, we have no experimental evidence to indicate that tachyons do exist.

What is the speed of light?

The particles of light, or photons, therefore move at the speed of light. This is the only speed at which photons can move. They can’t ever speed up or slow down.

What does v2/c2 mean?

which means that the value of the denominator ("the square root of 1 – v2 / c2 ") will get closer and closer to 0.

How fast can you move?

One commonly known fact in physics is that you cannot move faster than the speed of light. While that’s basically true, it’s also an over-simplification. Under the theory of relativity, there are actually three ways that objects can move: 1 At the speed of light 2 Slower than the speed of light 3 Faster than the speed of light

How to explain how a river is moving at a constant speed?

The river forks into two branches, with one raft floating down each of the branches. Though the rafts themselves are each always moving at the same speed, they are moving faster in relation to each other because of the relative flow of the river itself. In this example, the river itself is spacetime.

What happens when light goes from a vacuum into another material?

As I mentioned earlier, when light goes from a vacuum into another material, it slows down. It is possible that a charged particle, such as an electron, can enter a material with sufficient force to move faster than light within that material. (The speed of light within a given material is called the phase velocity of light in that medium.)

What are solitons capable of?

With sufficient energy, configurations of these solitons could function as ‘warp bubbles’, capable of superluminal motion, and theoretically enabling an object to pass through space-time while shielded from extreme tidal forces.

What is the new class of hyper-fast solitons?

Lentz) In the new work, Lentz proposes one such way we might be able to do this, thanks to what he calls a new class of hyper-fast solitons – a kind of wave that maintains its shape and energy while moving at a constant velocity (and in this case, a velocity faster than light).

When is Lentz’s YouTube presentation?

In addition, Lentz will be explaining his research in a week’s time – in a live YouTube presentation on March 19. There are still plenty of puzzles to solve, but the free-flow of these kinds of ideas remains our best hope of ever getting a chance to visit those distant, twinkling stars.

Is warp drive a possibility?

It’s an impressive feat of theoretical gymnastics, although the amount of energy needed means this warp drive is only a hypothetical possibility for now.

Do physicists give up easily?

Physicists are not the kind of people who give up easily, though. Give them an impossible dream, and they’ll give you an incredible, hypothetical way of making it a reality. Maybe.

Does negative energy have a quantum scale?

While this kind of negative energy happens on a quantum scale, piling up enough in the form of ‘negative mass’ is still a realm for exotic physics. In addition to facilitating other kinds of abstract possibilities, such as wormholes and time travel, negative energy could help power what’s known as the Alcubierre warp drive.

Is hyper-fast soliton a negative energy density?

According to Lentz’s theoretical calculations, these hyper-fast soliton solutions can exist within general relativity, and are sourced purely from positive energy densities, meaning there’s no need to consider exotic negative-energy- density sources that haven ‘t yet been verified.

How fast can light travel through the universe?

For generations, physicists believed there is nothing faster than light moving through a vacuum — a speed of 186,000 miles per second. But in an experiment in Princeton, N.J., physicists sent a pulse of laser light through cesium vapor so quickly that it left …

Why does a pulse look like a straight beam?

The light can leave the chamber before it has finished entering because the cesium atoms change the properties of the light, allowing it to exit more quickly than in a vacuum.

How did the Princeton experiment change the circumstances?

The Princeton experiment and others change these circumstances by using devices such as the cesium chamber rather than a vacuum.

What did Albert Einstein test?

The Princeton experiment and others like it test the limits of the theory of relativity that Albert Einstein developed nearly a century ago.

Which edge of a light pulse has all the information needed to produce the pulse on the other end of the chamber?

The leading edge of the light pulse has all the information needed to produce the pulse on the other end of the chamber, so the entire pulse does not need to reach the chamber for it to exit the other side.

Who is the scientist who said the light particles coming out of the cesium chamber may not have been the same ones that?

Not everyone agrees on the implications of the NEC experiment. Aephraim Steinberg , a physicist at the University of Toronto, said the light particles coming out of the cesium chamber may not have been the same ones that entered, so he questions whether the speed of light was broken.

Is superluminal speed distorted?

Previously, experiments have been done in which light also appeared to achieve such so-called superluminal speeds, but the light was distorted, raising doubts as to whether scientists had really accomplished such a feat.