Richard Feynman Atoms
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- čas přidán 14. 04. 2009
- Richard Phillips Feynman was an American physicist known for the path integral formulation of quantum mechanics, the theory of quantum electrodynamics and the physics of the super fluidity of super cooled liquid helium, as well as work in particle physics (he proposed the Parton model). For his contributions to the development of quantum electrodynamics, Feynman was a joint recipient of the Nobel Prize in Physics in 1965, together with Julian Schwinger and Sin-Itiro Tomonaga. Feynman developed a widely used pictorial representation scheme for the mathematical expressions governing the behavior of subatomic particles, which later became known as Feynman diagrams. During his lifetime and after his death, Feynman became one of the most publicly known scientists in the world.
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'You can learn a lot by having a bicycle' - I love that.
He's a scientific poet.
I don't know why I love to watch those videos with Richard P. Feynman again and again. It is so addictive.
Btw, he mentioned cup of coffee... I need one right now. :D
He tells science like a story and I love that! Haha
It's like I'm listening to an adventure or something
hes inspiring and you can tell hes genuine in his fascination with the world we live in
his last few sentences in this video are a gem. hear that teachers!
I love learning things, especially science.
You should get a bicycle
A bit of demystification. There is this mr Susskind explaining or approaching string theory mainly bases on the Lagrangian, which my goodness is something everybody learns about at school. Simple kinetic and potential energy which is a formula from somewhere around 1788.
I love this man.
been my hero since i first discovered him
What is the full video called?
to break non tensile #8 wire, you bend it over itself, make a tight u-bend, then open it and close it again and again, it gets 'burn you' hot.
3:12 - it heats up simply because your jiggling it... hahahaha ROFL
This is one that Feynman got wrong. Heat in a crystalline solid cannot possibly be as he describes. Heat conducts through crystalline solids at abysmal speeds. The level of isolation that you need whether in terms of reflection coefficients or as energy stores or wells. Yes I suppose that is Boltzman, but where is the geometry?
Physics is very different at low temperatures. At room temperature heat conduction is messy, it becomes a lot easier to understand (and much faster) at cryogenic temperatures.
@@schmetterling4477 Thank you. This is a new detail that I hadn't heard. The discrepancy between thermal conduction and acoustic conduction is roughly the problem. If both are atoms on springs in a lattice (solid state) then they should be equal. They are not. Heat conduction is abysmally slow. With no theory to rest its head on. No conflict even discussed. I get that things change at cold temps. Still, the crystalline lattice remains at high temps.
@@timothygolden5321 In a pure crystal at low temperatures all excitations are linear and heat propagates like acoustic waves (think of the equivalent of white noise). The heat itself moves atoms out of their ideal positions, though, so the crystal structure gets disturbed. This acts like impurities and the plane waves that could travel undisturbed at low amplitudes are now being scattered in all directions, including backwards. This slows energy propagation down. By the time we reach room temperature in solids, these non-linear scattering processes have completely overtaken the linear process, so, yes, it's messy and the theoretical description is complicated. That's why the most important equipment in solid states physics labs is usually the cryogenics to prepare samples at typically 4.2K liquid helium temperature. That's where life is fun in solid states research. At room temperature... not so much.
@@schmetterling4477 The funny thing is that this knowledge has not been disseminated. It does not exist for instance in Kittel's Introduction To Solid State Physics. You are the first person who has managed to portray what appears to be the correct answer. I agree that reflected energy could address the discrepancy. Yet this opens a can of theoretical worms if you believe that the electron shells are truely discrete in nature. Where is the blur of spectroscopic pattern in these hot crystals? Thermal expansion may cover this but ultimately as I see it the status quo rendition of the atomic structure is dubious. Possibly the lattice is in temporary disrepair in what we consider to be an ambient temperature crystal. This would be like ionic bonds treated more akin to covalent bonds. These transients should be observable somehow though...
@@timothygolden5321 Electron shells are an approximation that works alright for individual atoms and chemical reactions. It is next to meaningless in solid state physics, unless we are talking about shielded configurations like in rare earth elements. I don't understand your question about spectroscopy. Of course there is thermal broadening, but solids usually do not produce neat line spectra, to begin with. Only atomic and molecular gases do.
Everybody likes to jiggle!
Nice but actually , heat is not exactly jiggling atoms. They are indeed jiggling but that is not what causes heat When electrons bounce up to a higher level and and then gets down back again to its lower energy level, they emit a certaina mount of energy, thats when an object it emits "light".A specific band of light us humans perceive this as heat, the infrared range
hush, he was talking about specific heat transfer on contact called conduction, seems to be right on the spot on that one
hush back
this is Richard fucking Feynman you're talking about bro. now hush
I'm not sure which of you two is worse; mindlessly parroting what you memorized in class in school or mindlessly engaging in hero worship, like a lovestruck teenie bopper, elevating personalities over science.
crashsitetube watch out everyone, we got big words over here. No one can have fun, someone broke out the big guns. Look at you. You think you're perfect don't you?
Lol ..best ...what spreads it jiggles ..irregular motions
God less thaights means scince