# How can light accelerate to such a huge velocity?

• aby001234
In summary, the conversation discusses the concept of light having relative mass and where it gets its energy to accelerate at such high velocities. It is mentioned that photons have zero mass but still have momentum due to their velocity. It is also noted that photons do not accelerate but move at c from emission to absorption. The possibility of an experiment to measure recoil from a photon being generated is brought up, as well as the idea of a Planck time being the smallest time measurement possible. The conversation ends with speculation about the nature of photons and the idea of going to bed.
aby001234
I mean if light has relative mass
which makes its mass near to infinity,
then from where does it get the energy
to accelerate such a heavy thing to such a
huge velocity?

DaveC426913 said:
Photons have zero mass. That's why they can - and must - move at c. They do have momentum, due to their velocity.

(http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/relmom.html - "Momentum of Photon" - halfway down the page)

Photons do not accelerate. They move at c from emission to absorption.

Has that been proven?

It would be interesting to see an experiment to see if there were recoil from the generation of a photon from a hydrogen atom electron orbital change.

zero to c in a Planck moment.

hmmm...

never mind.

wiki said:
One Planck time is the time it would take a photon traveling at the speed of light to cross a distance equal to one Planck length. Theoretically, this is the smallest time measurement that will ever be possible,[3] roughly 10−43 seconds. Within the framework of the laws of physics as we understand them today, for times less than one Planck time apart, we can neither measure nor detect any change. As of May 2010, the smallest time interval that was directly measured was on the order of 12 attoseconds (12 × 10−18 seconds),[4] about 1024 times larger than the Planck time.

I can't imagine anything that tiny.

But then again, maybe the photon was always there, traveling at the speed of light, and was simply manifesting itself as the particle we observed before, in some twisted poly-dimensional world we will never comprehend.

But then again, maybe I should go to bed.

OmCheeto said:
It would be interesting to see an experiment to see if there were recoil from the generation of a photon from a hydrogen atom electron orbital change.

There IS a recoil, although so tiny that we can't imagine it.

I can provide an explanation for how light can accelerate to such a huge velocity despite having a relatively small mass. First, it is important to understand that light does not have a rest mass like other particles. Its mass is a result of its energy, as described by Einstein's famous equation E=mc^2. This means that light's mass is not "heavy" in the traditional sense, but rather a manifestation of its energy.

Secondly, light travels at a constant speed in a vacuum, which is known as the speed of light (c). This speed is the maximum velocity that any object can reach in the universe. It is not possible for light to accelerate beyond this speed, as it would require an infinite amount of energy, which is not possible.

So how does light reach this maximum velocity? Light is a form of electromagnetic radiation, and it is composed of particles called photons. These photons do not have rest mass, but they do have energy and momentum. When they are emitted by a source, such as the sun, they travel at the speed of light from the start. This is because they are massless particles and do not require any energy to reach this speed.

In summary, light's mass is not a traditional mass like other particles, and it does not require energy to reach its maximum velocity. Its speed is a fundamental property of the universe, and its mass is a result of its energy. I hope this explanation helps to clarify any confusion about how light can accelerate to such a huge velocity.

## 1. How is light able to travel at such a high velocity?

Light is able to travel at a high velocity because it is made up of particles called photons, which have a mass of zero. This means that they are not affected by the forces that slow down other objects, such as friction or gravity. Additionally, light travels in a straight line and does not experience resistance in the vacuum of space.

## 2. What causes light to accelerate?

Light does not actually accelerate in the traditional sense, as acceleration is defined as a change in velocity over time. Light always travels at a constant speed of approximately 299,792,458 meters per second. However, light can appear to accelerate when it passes through a medium such as air or water, as it is temporarily slowed down and then speeds up again upon exiting the medium.

## 3. How does the speed of light compare to other objects?

The speed of light is incredibly fast, and it is the fastest known speed in the universe. It is approximately 186,282 miles per second, which is about 670,616,629 miles per hour. This is significantly faster than the speed of sound, which is only about 767 miles per hour. However, the speed of light is not infinite and there are some theoretical particles, such as tachyons, that are thought to travel faster than light.

## 4. Can anything travel faster than the speed of light?

According to Einstein's theory of relativity, it is not possible for anything with mass to travel at or faster than the speed of light. This is because as an object approaches the speed of light, its mass increases infinitely, making it impossible to accelerate any further. However, there are some theories that suggest that objects with negative mass or exotic particles may be able to travel faster than light.

## 5. How is the speed of light measured?

The speed of light is measured using a variety of methods, including using lasers, mirrors, and precise time measurements. One common method is the use of a Michelson interferometer, which measures the difference in time it takes for light to travel different distances. This is then used to calculate the speed of light. Today, the most accurate measurement of the speed of light is done using the definition of the meter, which is based on the speed of light in a vacuum.

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