@@stalkinghawk9244 Maybe, but it's not really an apples to apples comparison, so seems unlikely. Even if we incorrectly assume each would interact w/ rods/cones in the same manner, visible light photons are in the 1-10 eV range for their energy, where as cosmic rays range from 1Gev to 10^8 TeV!
@@tryfergoodra552the speed at which things can travel varies based on what medium they travel through. Sound waves are a great example. Sound waves are effectively the vibration/displacement of matter that we pick up via our eardrums. They move outward from the source more or less exactly like a ripple in a pond. Because it travels through particles moving, the closer together the particles are the faster the displacement can travel. Hence, sound travels faster through solid objects than through water, air, etc. this is also why there is no sound in space, there is no matter to displace Light behaves quite differently, and takes knowledge of quantum physics/mechanics to truly understand, not something I’m gonna even bother trying in a yt comment section lol Regardless, I hope I helped a bit
Not many people get to see this sort of phenomena in person. I did when I worked for a Nuclear Power Plant. It is still one of the coolest things I've ever seen.
@@desbugfan8429 Hmm, good point, but I'm pretty sure the plural use works here as this in a reoccurring event and is happening in each of the many rods in the pools.
cap . this is visible in small experimental testing reactors there is no way you would be able to look down into a reactor in a working nuclear energy plant
@@xgladar Didn't know about the small experiments, but that's neat. And I never said I looked down into a reactor. It was a cooling pool where "used rods" are kept. But they are still very much active and hot which is why I could see them through like 200 feet of water; so cool! Will never forget the sight.
I was taught it sinply with this phrase: Chernekov radiation happens when matter moves through a medium faster than light moves through the same medium. It is important to emphasise them point of a medium.
@@aydinsha Well, it is going faster than the speed of light *in water.* The speed of light is a constant, but varies depending on the medium, much like the speed of sound. Nothing is faster than the speed of light *in a vacuum.*
@@Vi-Six Quick correction: "The speed of light is a constant, but varies" this is a contradiction. It is either constant or it isn't. In this case, the speed of light c is a constant but the *group* velocity of light in different media can be vary. Personally I don't like mixing up the term "speed of light" with the speed of group velocity since it fundamentally suggests c is changing when it isn't. It certainly does APPEAR that light is changing speed but it isn't, only group velocity. If you define speed of light as group velocity then it's technically not wrong but just misleading in my opinion.
If you didn’t know the reactor in the video is called the foxtrot 9 nuclear reactor and the type of uranium used is a mix of u-235 and u-238 or possibly plutonium-238
I've seen this in person. And I can say, without a doubt, that it is the most unique and special thing you can ever see with your eyes. There is quite literally nothing else on this planet that looks this way and it's impossible to mimic this effect with other means. It's super cool, the video unfortunately doesn't truly show what it looks like but it is truly amazing.
That sounds so cool! Did you work at a nuclear reactor? I wish I could see it with my own eyes too but I doubt they'll ever allow tours at nuclear reactors. I think they should though! The more the public learns about and understand nuclear power, the closer we get to a future where we harness that power and thrive. It is the safest, cleanest, and most effective source of energy we have yet invented.
@@Thetruthiscosmicif I recall correctly the reactor in video is some experimental one that is exposed in water so scientists can check how things work. I guess you would have to be quite influential like a science youtuber for them to allow you to check it out, or be a scientist and work there, or be their janitor lol
@@stasi0238 @Thetruthiscosmic As far as I'm aware it is possible to do tours at very *specific* reactors. The really small research ones specifically, but even so it's still extremely rare. I was doing research on radioactive decay and energy production. This is where the importance of things like Half-lifes come into play. Seeing the Cherenkov radiation was so special though. Definitely a dream come true and for sure on of my top 5 favorite memories I've ever had.
I worked in and out of nukes for almost 40 years and the nukes today are a lot different than the old ones. They give you 2500 millirems per quarter of radiation that you can get, and years ago you would sometimes get close. The new plants, you don't get much more than if you worked outside
I worked thirty seven years at a nuclear power plant and opening up the reactor for an outage was always cool to see. Also when fuel handlers moved the fuel rods. That neon blue glow is both beautiful and deadly.
Yeah i was a fuel handler for 5 years before transferring, definitely cool to see but the glow made it so hard to line the bundles up with the top rack especially right after shut down and using the cameras was never fun 😅
@@dav1342 Oh god I've seen such a disaster on kyle hill's channel. 2 guys carried a cylinder like thing on their back for hours which was very hot and later they started vomiting and i don't remember the number but like 300-3000 or maybe 30000 cylinders were removed from the forest.
Well that explains why Godzilla's breath weapon is blue. Fun Fact: They actually made a reference to this phenomenon in 1962's King Kong vs Godzilla. When a group of scientists go to investigate mysterious activities around a group of icebergs and stumble across an area where this same blue light is emitting from around one of the icebergs.
Lol Water is actually an incredible shield against radiation, but yeah media often skews anything regarding radiation so that information is not well known
Fun Fact: the difference between *the speed of light in a vacuum* and *the speed of light inside a material* (i.e. *not* in a vacuum) Is the basis for the Index of Refraction of that material. How much light slows down in a material describes how much it bends the light. Bonus Fun Fact: the "negative index of refraction" metamaterials do *not* make light go faster than light in a vacuum, nor is their index of refeaction actually negative, its just between 0 and 1. It's just a naming convention. These materials bend light opposite the angle that a non-metamaterial does, they do not "speed up" the light, that wouldn't make any sense.
@ghostlyfieldclub2930 yes. It is fascinating, and it comes from wave/particle duality. I'll try to summarize, but you can absolutely read more about it, even the Wikipedia article is really helpful. Okay, so the lower mass something is, the more like a wave it becomes. Photons behave the most like waves. Particles with mass, like electrons, also behave like waves, but to an ever-so-slightly-less degree. Waves propagate through a medium at what's called the *phase velocity*. Photons are strictly limited to that, but charged particles can move past the atoms of a dielectric material (a material that can be polarized), and excite that polarization faster than the phase velocity. When atoms are excited, they relax by releasing photons. But since the excitation is faster than the phase velocity, the resulting photons that are released lag behind the exciting charged particle, creating something similar to a 'sonic boom' of light, which is the blue that we see. Photons are limited to the phase velocity, so they can't create the same asymmetric excitation that the charged particles can. So in this very specific instance, where light behaves almost too much like a wave, charged particles can go faster than photons. In a vacuum, the limitation is back to being accelerating mass, and photons win by having no mass. Side note: things like this are also why some materials are shiny, but that's from something called the 'plasma frequency', and it's a whole other story.
Explanation: the speed of light in vacuum is approximately around 300.000 km/sec but the speed of light in water ist slowed down to approximately 225.000 km/sec. The particles in water are bit faster than 225.000 km/sec and because of the difference, you can see the blue light as a result of an echo.
Naaaa that's bullshit one of the safest places to work is a nuclear power plant search about WANO the other day I was working with a french guy from WANO an amazing guy
To be fair, it's kinda more of a "a sonic boom isn't from the jet hitting you, but from a shockwave being made from it moving too goddamn fast." It's just that light and Electromagnetic radiation are made from the same thing so it's clumsier to explain.
It's important to make the distinction that the particles accelerated by the reacter aren't breaking the theoretical speed limit of the universe, i.e., the speed of light in a vacuum. The speed of light in water is ~.75c (c is the universal constant for speed of light in a vacuum). So, particles can travel faster than the speed of light in that medium without violating the Theory of Relativity.
also, it's important to mention that the light itself isn't slowed down, it's just hitting a lot of atoms, so it bounces around and curves more. C stays constant
This brings back memories as a nuclear engineering student at Arizona. For various classes/experiments we'd need to pulse the reactor and you'd get to see the chernekov radiation. For those lucky few that happened to be walking by the reactor lab when we did this, they might look up at one of the mirror above the reactor pool when they see a bunch of students around the reactor and catch the show too.
To all the people saying light moves slower in water: it does not. because of the medium, the light simply has to take a more "crooked" path, making it take longer. light speed is constant regardless of medium. EDIT: Since I keep getting comments correcting me, and can't find my other comment down in the replies, here's some additional information: I'm obviously simplifying in my original comment, but it's essentially the same end result. Basically what happens is, when light goes through a medium, the reason it takes longer (longer path), isn't because it tries to "avoid" particles or molecules as it may seem in my original comment, but rather, it's disturbed because the light keeps getting absorbed and re-emitted by the atoms in the medium, making the path way longer. When a particle moves faster than light can to complete this process (distance becomes easier to clear for the particle than light), then a shockwave occours in the electromagnetic field due to it's inability to re-adjust in time, causing the emission of blue light in this case
No. Cherenkov radiation is not created by objects moving faster than light speed. It's created by the electric field moving through a medium at a certain velocity of propagation. If the electric field moves through the medium faster than the medium can emit light, a charge is built up and released in the form of Cherenkov radiation. It has more to do with how fast an atom produces the photoelectric effect and not really anything to do with the speed of light.
For someone trying to sound smart you should know there is nothing of an "electric field"... There are electromagnetic fields, and visible light is just a narrow band within the electromagnetic field
@@Nidvard The behavior of the electromagnetic field can be resolved into four different parts of the variation in space and time: electrostatic fields, static magnetic fields, varying electric fields, and varying magnetic fields. The first two are produced by charges and currents, which are then combined into the electromagnetic field tensor in the presence of both a distribution of velocities of charges and currents. The behavior of electric and magnetic fields, both as separate entities and as a collective whole, are governed by Maxwell’s equations. This behavior of the electric field as defined by Maxwell's equations is what I was referring to. The electric field becomes out of phase with the emitted light wave and builds a charge that creates Cherenkov radiation. The electric field moves at a fraction of the speed of light as denoted by the velocity of propagation. Also, I didn't say anything about the visible light spectrum. Or the magnetic field as I'm referring specifically to the electric field and its charge. I hope that makes sense. Let me know if you have any more questions.
By Einstein's ToSR and ToGR, light has a constant speed, always equal to c. However, many wave interference effects take place in a reradiating medium, such that the velocity of light's PHASE becomes lower. In other words, a phase shift at each reradiator (atom) layer, that at larger scale looks like slower light with shorter wavelength. Highschool physics most often just set it as a given that light slows down, but without explaining the mechanics behind it.
to move faster than light, you need to have a super fast reaction, it cant be in a vacuum and it needs to be in something to slow down light. pretty cool
Cherenkov di... your bro here simply made a vid on a well known phenomenon and misrepresented it. One more thing, it's been known that quantum entanglement blows all this out of the "water" since Einstein was working on his big equation.
The light particles are slowed down in the pool. The radiation in the pool moves faster than the photons in the pool. The radiation is not travelling at light speed, not even close. It's just bad wording.
I was taught in class that the phase velocity is going faster than light, not the group velocity which correspond to the speed of light ''c'' that you refer to.
Cherenkov radiation is electromagnetic radiation emitted when a charged particle (such as an electron) passes through a dielectric medium (such as distilled water) at a speed greater than the phase velocity (speed of propagation of a wavefront in a medium) of light in that medium. You've missed to say 'faster that speed of light in that medium' doing a huge blunder . Nothing can move faster than speed of light in vacuum.
besides the difficulty of filling the galaxy with water, it still wouldn’t make us move faster. cherenkov radiation occurs when light is moving slower than it should be, so for example the light in this video is moving at 0.7c, and the other particles are moving at 0.8c. that still is less than c, it’s just that the miscellaneous particles are moving faster than the other photons in the solution.
No, it’s unrelated to that. It’s just electron emissions from the electrons gaining energy and then falling back to a stable lower energy. When this happens a photon is released, it just happens to be blue because of the material and the speed of the particle.
Blue-shifted light can actually be any color. The reason we call it that is because blue light is higher-frequency. If visible light from something coming towards us is higher-frequency than it should be due to its motion then it has been shifted closer to being blue, or blue-shifted, and visible light that is lower-frequency than it should be has been shifted closer to red, or red-shifted. You could just as easily call it violet-shifting and have it be arguably more accurate. In other words, if an object should only be glowing in the infrared but it's moving quickly towards us and it appears to be red as a result, the light was still blue-shifted. Likewise, if a violet object is moving away from us and appears blue as a result, the light was still red-shifted.
@@sreea2365there is reflection, refraction and also gravitational influences. neither of those phenomena is a straight line. you might argue that reflected light is a straight line followed by another, different, straight line. you would be correct. then again a curve can be seen as infinitely many straight lines in succession, which is also correct. to get there you use differentiation. now you might argue there are no curved lines at all. you would be correct, in a certain sense. Still, circles exist, and if you say a circle is a straight line i will call you silly ;)
I genuinely thought the first 2 seconds were the beginning of some cool anime opening, then it was educational. THEN it got super cool at the end. It SHREDS light. Dude that is so metal. I want that superpower.
This is definitely a phenomenon to be studied because it is a direct correlation between light and matter or electron. And particle physics first hand.
