Does light have an expiration date?
Does light last forever or does it have a time that it can exist?
So does light wear out or is it something that doesn't wear out?
And if it lasts forever, why is it able to exist forever?
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Light can be described as an electromagnetic wave. And electromagnetic waves can be absorbed. You can call that a kind of wear if you like, even if I wouldn't. What goes in the same direction is that by interactions light can change its energy and thus its frequency, ie its color. As a result, the light that is previously visible, which is then no longer.
When the light field is quantified, producer and destroyer operators are also introduced. A photon is thus produced during emission and thus produced, but destroyed during absorption. Well, that's not really happening, but it doesn't exist anymore than Photon.
Light is a form of energy.
Energy cannot be created and not destroyed – only converted.
To convert light into another form of energy, it must interact with something, that is mainly matter.
In a perfect vacuum, light would therefore continue to "travel" infinitely long.
Even space is indeed full of matter. Very little, but present. Therefore, the light then hits a dust particle at some point and if it is not reflected, it converts its energy and can then heat the dust particle, for example.
The Hubble and the James Webb telescope in space observes light that was on the road for millions or even billions of years.
I take it has no half-life, like a radioactive particle. So it won't fall apart in any longer, finite, time. But that's not infinite. So if a photon had been created before an infinitely long period of time, I think it is possible that it would eventually collapse. But from the time of decay we would have to be in the future again infinitely long.
What is light supposed to wear? Light is not a "thing" that can smell or rot. The photons from the cosmological horizon had been stretched to us for over 13 billion years and on the go only a little in the wavelength.
Light never wears. A photon is produced when an electron changes its energy level in an atom, molecule, and "degenerates" when another electron "removes to a higher energy level". In between "lives" it in principle as long as desired, experiences changes such as red shift etc.
Light is a very special something, is basically only recognizable when it comes to the creation and disappearance. Always referred to a single photon.
Light has no expiry date, the light through which we can observe objects in the universe is partly on the move for billions of years.
Based on photons, there are particles that cannot decompose further, similar to electrons, neutrinos and some others. Photons thus do not have a decay date in the sense, they still exist when the universe will be completely empty in an unimaginable long time.
The Janes Webb Space Telescope has proven that there are further galaxies that are up to 30 billion light years away in distances beyond the previously assumed 13.8 billion light years.
From these huge distances the light has been on the move billions of years until it becomes visible to us.
It can therefore be assumed that the life of radiation and thus also light is unlimited.
Why should one believe that the life of radiation can be older than 30 billion light years if there is no evidence that there is older light radiation than 30 billion light years?
I can only advise you that you build a space telescope that strikes the JWST for longer. You will not only be able to prove that light lives longer than 30 billion. Years and might have the view of a Nobel Prize.
Just have to find a sponsor for it. —Ask Elon Musk. that might interest him.
Light is an electromagnetic wave…
If this isn't going anywhere, it's going on forever…
The amount of light may be distributed. over the distance over an ever larger surface…
But the astronomers value light that was on the move for billions of years (and correspondingly gigantic distances)…
No, it is stable at least until 18.4.2433, but can also be absorbed afterwards.
The light moves at speed of light until it is absorbed. For the light, the time from outside passes infinitely slowly, since it has a speed of light.
Hi, lights are photons so pure energy. And energy can't disappear. That means light doesn't really have a date of decay.
Why? Because… you need to ask the laws of nature…
LG
Light is also a form of energy. And of course this has no expiry date
Lights are electromagnetic waves and they can be on the go for infinitely long.
Only a black hole can put an end to it.
This is not the case s. Light-matter WW, even if, for example, photons are first destroyed in a laser (absorption) and then generated again (emission), they have a completely different polarization with spontaneous emission or in some cases also the same as the original photon. But it can be put at an end to the original photon in a property (namely the direction and phase).
A beautiful video by Harald Lesch…
https://www.youtube.com/watch?v=CiIQ5WK8Sg4
Is the link missing or is it only not displayed on my device?
Probably not shown – I see the link. You can search on Youtube for “Münde Licht” and “Lesch”… 🙂