QED -- The Jewel of Physics (12 of 15)

[normanleto]

One question: we have a swarm of H20 particles,hitting each other. Some will join and stay together to form larger droplets, but some will bounce off by repulsion force. How exactly maseless photons involved in the electromagnetic force cause this bounce? Are photon wavefunctions (responsible for repulsion) emitted by electron wavefunction of the repelling H2O atoms? Or these force carrying photons wavefunctions are already "in the field" emitted before by any other sources?

...thanks

[comradek2021]

I can't help but cringe every time I see him hit his fist on the particle accelerator (isn't that the LHC? I'm led to believe that it is due to the underground facility, but I don't see anything blue so I'm not sure.) I KNOW he did that to the LHC before as well.

[henryong1000]

we can think of the photon, or particle, as a surfer riding a wave, who prefers to be at the highest point of the wave, or more specifically the crest, where the energy of the wave is the highest.. but avoiding places where energy is lower.. the higher the frequency, or lower the wavelength of the wave, which is what determines its color, the more crests or photons passes a certain point in a given time, giving us the notion that the wave has a higher energy..

[henryong1000]

waves are transfer of energy without the transfer of matter itself.. more like the transfer of disturbance through space or a medium.. but remember that according to einstein, energy is mass.. so we can say that transfer of energy is also the transfer of mass and it is this transfer of energy that we can refer to as light being a particle, a photon..

[x1x2x3ct]

he is such a gay faggot

[hovsec]

its funny how he always says , you need one of this, like you could actually get one, it would be so cool if could

[Voiderify]

nice video. I wonder if it was really necessary to get 2 ice skaters passing a ball to illustrate the principle...

[womo1975]

The acceleratoe is a big pile of steaming shit

[azdgariarada]

Those were some sexy electrons!

[AmokBR]

QED was first formulated by Dirac!

[MrEvanOden]

* :| ....What?

[Spartanboy3000]

Did he say "double v?"

[ronpaulbot]

After watching the first 12 of these clips, i get the feeling Brian Cox would make a great particle accelerator salesman :)

[TedDGPoulos]

The most fundamental question of all: What is The underlying law of nature.

[sidewaysfcs0718]

a photon is not an escaped electron ....first off photons have no mass ..electrons do..

[willingtorisk]

A planet growing through the illusion of sense experience consciousness.

[sinwow33]

Photons do not carry charge. The charge of the electron is an intrinsic property of the electron.

I wonder why they did not dicuss QCD as well.

[Thymonico]

Because the QED is more fundamental and we know more about it... QCD is difficult, REALLY difficult... ;)

Altough, I would really like Brian to teach us about it.. :D

[Shalek]

So electrons carry photons and photons get passed from one electron to another and that causes the electromagnetic force? Does that mean that charge doesn't depend on the electron anymore? Are they responsible for anything other than carrying photons around? I think I am going to blow a fuse.

[buhisukeyu]

electrons don't really carry photons - the photons are brought to existance because the photons are bosons - particles that can be put together infinitely because of their spin it's not taht hard to produce them lit a candle and you have your photons

the electron 1 produces a photon that is absorbed by electron 2 transmitting interaction.

you should either read feynmans book or deal with feynman diagrams, they're almost selfspeaking

[acquiesce022]

Ummm, the photon is the energy "messenger" particle for EM radiation energy. It is either emitted or absorbed usually by electrons and some fermions or some bosons. Don't think of photons as a particle, but in terms of self contained energy. When another photon or some other type of energy (like heat) excites an electron enough, it'll either emit (jump to a lower atomic orbital) or absorb (jump to a higher orbital). The EM force is a measure of electrical/ magnetic interaction in matter.

[Shalek]

Damn I love it, it's so disgustingly confusing, if only we could see exactly how it looks/happens. What is heat made of? What is the difference between a particle and self contained energy, I picture them(both) as 'dots' of stuff. Electrons I've heard are more accurately described as waves, waves of themselves. I think I am going to read feynman's book.

[acquiesce022]

Firstly, thank you for an evocative response, I get soo few....sadly.

Now, Firstly, in the case of most "energies" like magnetism or heat, since they're really an effect of some process or transformation of another energy, their effects are really all we get since magnetism and heat are like warps in space/ time (photons or gamma particles are the particle involved with both, but we can't really see them).

[acquiesce022]

Also, electrons are capable of both particle or wave qualities depending upon energy state. Self contained energy is really a descriptive term, E=mc^2 means that energy and matter are interchangeable under certain conditions. Instead of Feynman's book first...I'd suggest the wikipedia and some quantum mechanical basics, first and then brush up on high school physics and chem. I have a great Q.M primer called "Quantum Universe", it explains well, good luck in your knowledge quest!

[jamesstone123]

photons (although have no mass) have a lot of energy. Using E=MC^2 alone, its obvious that a particle with mass can be discharged by energy. Frequency can be taken as energy, and so by knowing the frequency of a light, we can predict how the light will react to electrons

the photoelectric effect explains this best.

[NoSz4]

A photon is an escaped electron :)

[mikebe41]

ok if it is an escaped electron, does that mean the atom dynamics change, because of one less electron?

[NoSz4]

It was a joke, obviously you didnt get it.  When an electron escapes its orbit it either gathers or releases energy. That energy is a virtual exchange of photons.

[sidewaysfcs0718]

while elementary particles can become other elementary particles throo certain processes ..u cant say a photon is an escaped electron .... a photon is the carrier particle of the electromagnetic force...

[NoSz4]

it was a metaphor as already pointed out bymyself in a later post. Please read all before you comment.

[sidewaysfcs0718]

yes an electron can absorb photons so electrons absorbing excaped electrons doesnt sound like a good metaphor :(

the best name for a photon would be ..pure energy ..since its a particle that carries energy ...itself has no mass , no charge, no color charge ..no weak charge ...its basicly ...almost nothing at All...but its very very important to us.

[NoSz4]

wow, all i meant by it was when an electron escapes its orbit, it releases photons. Therefore escaped electron = photon. not escaped from the atom, but escaped from its orbit.

There where the metaphor is, I know what a photon is.

"since its a particle that carries energy ...itself has no mass"

it does not have no mass because it carriers energy, every particle carriers energy.

e=mc2

[sidewaysfcs0718]

i know that ....but ment photons are energy carrier particles ..and also happen to be massless

the W and Z bosons are also energy carries but have mass ..lots of it...

the guon is just like the photon except it mediates another force..

massless particles do have energy but have no mass ...their energy can be converted into mass

for example photons rays can decay into electrons and positrons ..wich is reverse anihilation otherwise called matter creation.

[NoSz4]

I dont know why you think you are teaching me something. There was nothing wrong with the metaphor, you just couldnt comprehend it. And the Gluon has 8 colors, so dont see how comparing a photon to a gluon was any better then my 'escaped electron' comparison.

Please wake up.

[sidewaysfcs0718]

i said they are alike cus they both have no mass and are bosons ....thats the similarity between them ...

i was just poiting out that th metaphor doesnt make sense ..u could just say a photon is an escaped piece of an electron that would be more fitting

wtf are we arguing with this i got creationist to debate not complaining about semantic :(

[philsaspiezone]

These carrier bosons were descovered in 1980. Not the gluons though.

[aconstantfalling]

he keeps hitting that particle accelerator! hes gonna break it

[dibbuck]

I was going to say thet! - He has a mighty thump indeed

[Auxcuentas]

love it!

[facelesspunk]

I wish this video was more in depth. I mean I really like it but I feel like I'm missing out on alot of imformation. Oh well this at least give me some thing to think about till I find out more.

[dibbuck]

deep information is now prohibited - egalitarinism is an integral part of the 'Globalisation' idiology currently promoted worldwide. Mentally challenging media material is hence discouraged. You may come to know this process as "dumbing down"

[psychobollox]

bollocks!

this is for comprehensive school students studying at GCSE level!!!

stop being a dippy twat and look at the fucking info given!

jesus fucking christ!!!!

thank fuck you're not a teacher!

[dibbuck]

I smear shit on your forehead!

[psychobollox]

you wouldn't get fucking close enough, dipshit...

your education was definitely wasted on you.

get back into the closed ward.

soon.

preferably now.

[dibbuck]

you unhinged scrotum! - Hang on, what is this arguement about exactly? I think I've missed something. Can you list your points of contetion please?

[psychobollox]

i was clear enough in my first post to you.

if you can't get it from that, you need serious help.

you dipshit.

[dibbuck]

Hang on oddball - so far all you've posted is a meaningless tirade of insults with no explaination. This is fine as I find hurling creative insults on youtube to be most amusing, but you'll need to clarify what we're argueing about.

[psychobollox]

you said: "You may come to know this process as 'dumbing down'"

I said: "this is for comprehensive school students studying at GCSE level!!!"

you said: "I smear shit on your forehead!"

what's your problem?

now just pack it in, okay?

[dibbuck]

Ah, I see - when I said "you may come to know this process as 'dumbing down'" I was referring to the reduction in depth in general mainstream educational media and alluding to this being part of a political process. I said "I smear shit on your forehead" to mean just that. Now scoot you sematically challenged goofball

[psychobollox]

particle physics for GCSE level students can't be anything much more complicated than that programme show it, since it's heavily mathematical. as for that simplicifation being part of a political process... not entirely; but i can agree that there's is a general trend to 'dumbing down' in education (sadly).

the old GCE O-level syllabus in maths contained and intro to calculus, which is missing in the GCSE... result was that it weakened the students' knowledge prior to entry to A-level.

go.

[AmokBR]

@facelesspunk If you want more depth on the subject, you need to start writing equations down.

[RJL738]

It's proibly more than just photons that carry the charg of the eletron. That guy is obviously very smart and interesting. I wonder when this docomentery was made.

[kingmebornold]

i love that guy wish i could sit down and have a conversation with him,... the young guy

[rusurazvan]

me to

[hagiaadrasteia]

Thank you for posting this excellent series. It is a wonderful overview and clearly understandable for those not privvy to the language of mathematics (and which did not make me feel like utter idiot it!" Great and inspiring work.