Feynman: Seeing Things FUN TO IMAGINE 8
ฝัง
- เผยแพร่เมื่อ 28 ส.ค. 2024
- Now! High quality version at • The complete FUN TO IM...
Physicist Richard Feynman thinks aloud about swimming pools and the wonders of the electromagnetic spectrum. From the BBC TV series 'Fun to Imagine' (1983). You can now watch higher quality versions of some of these episodes at www.bbc.co.uk/archive/feynman/
There were times of doubt in my undergraduate studies and I used videos like this to motivate me through the technical wizardry.
I like it when he's SO enthusiastic that he shouts. It's exciting
Absolutely brilliant. I love how his mind wanders, yet it all seems to make sense. Like a wild hippy trip!
The inconceivable nature of nature. Wow
what an incredible personality....
he is the epitome of the creative mind ~ love him (and so happy to have so many youtube videos to keep his spirit alive!)
What a magnificent mind...
When I need Richard Feynman, I always find him in the TH-cam. I can't even imagine he is not with us anymore!
"electrons pushed back and forth"
holy shit, i never thought of it that way before.
thank you, feynmann!
I never tire of listening to this incredible genius and witty man!
A great man
I love this guy. He had a brilliant way of looking at the world.
Beautiful analogy
This guy is the best!
@caltgelt ~ essentially, it takes a particle to move in "waves"... or there would be nothing.
The question of particle type, and velocity are the delineation of type of emission.
Every time I feel a bit down, all I have to do is get a good dose of Feynman. Cheer you right up...
Transcript:
Richard Feynman (1983)
"If I'm sitting next to a swimming pool, and somebody dives in - and she's not too pretty, so I can think of something else - I think of the waves and things that have formed in the water. And, uh, when there's lots of people have dived in the pool there's a very great choppiness of all these waves all over the water and to think that it's possible, maybe, that in those waves there's a clue as to what's happening in the pool. That some sort of insect or something with sufficient cleverness could sit in the corner of the pool and just be disturbed by the waves, and by the nature of the irregularities and bumping of the waves have figured out who jumped in where and when and where what's happening all over the pool. And that's what we're doing when we're looking at something. Uh, the light that comes out is ... is waves, just like in the swimming pool except in three dimensions instead of the two dimensions of the pool it's they're going in all directions. And we have a eighth of an inch black hole into which these things go ... which, uh, is particularly sensitive to the parts of the waves that are coming in a particular direction it's not particularly sensitive when they're coming in at the wrong angle which we say is from the corner of our eye. And if we want to get more information from the corner of our eye we swivel this ball about so that the hole moves from place to place. Then ... uh, it's quite wonderful that we can see ... figure out so easy. That's really because the light waves are easier than the ... the waves in the water are a little bit more complicated it would have been harder for the bug than for us but it's the same idea. Figure out what the thing is that we're looking at at a distance."
Transcribed from footage included in the documentary "The Last Journey of a Genius" (1989) by Christopher Sykes, a BBC TV production in association with WGBH Boston and Coronet/MTI Film and Video.
The world needs ppl like you!!! Thank you
Thank you!
Thank you
You might be a very big fan of Feynman to write down all those stuffs.
This guy is so funny.... .I lovem. Nobody I know puts it better
Being able to watch Richard Feynman talk about science is one of the great joys of life.
So many awesome quotes in this one.
i'll bet that the single dislike for this video was just someone clicking in the wrong place, such is the incredible nature of this video
I can’t believe I’ve seen this video and it has went right by my head, until I was looking into it all on my own 😅
im so impressed of him, i love to listen to his theories and funny mimic which made me laugh out of my heart
One person doesn't appreciate pure genius when they see it.
This is the kind of stuff we've all (I hope) given consideration to at some point or another - about how light waves of many times are all present ANYWHERE we go, yet all we need is a specialized instrument, device, or what have you, to decipher and "realize," so to speak, these waves.
he's so brilliant!
Wow I can't stop smiling while i watch him idk what it is but He is simply AMAZING :D
and it's all REALLY THERE
Thanks off the air!
What a beautiful mind !
If every teacher in this world was like this guy we would have had more scientists then we would have known what to do with - he has this talent of making everything dazzlingly fascinating!
whenever im watching these videos i catch myself smiling at the screen like an idiot
I imagine the camera man standing there with an open mouth and brains melting out of his ears.
I grin all the time when I hear this man. He really knows how to make physics fun and intresting
*inconceivable*
This guy is really interesting and fun to watch!
I know English not good enough to understand speech without subtitles. But his explanations of physical laws are so fascinating and interesting that it encourages me to learn this language more thoroughly to understand what he is talking about! But at the moment I would be very grateful if someone writes what he said 5:10 - 5:30 (something about peace of wire).
Then you pick a piece of wire, and connect it to a box, and in the wire the electrons will be pushed back and forth by this electric field, swashing just at the right speed for the certain kind of long waves, and you turn some knobs on the box to get the swashing just right, and you hear radio Moscow(?), so you know that it was there, how else did it get there, it was there all the time...
Imagine if we could see the entire spectrum. just imagine o.0
The ENTIRE wave spectrum...
Sounds like the world would be preeetty vibrant.
We are with the help of instruments.
"The inconceivable nature of nature". Thank you ChristopherJSykes for uploading these videos.
That glee at 5:47 tells us the entire story.
Any one notice that we can sense the movements in the pool and tell who did what from where? The waves are pressure differences in the water, and if you're in the pool, You do have a small hole that can sense it. It's Your ear. You can hear the Waves in the pool and tell what's happening
@caltgelt ~ as they "fill" the chamber (after all, they are particles), they pour out the emitter, still vibrating at the freq dictated by the size of the chamber.
Not cosmic waves at all, even though those frequencies may be the same, it is the type particle thats different (only 1 - 2 % of cosmic rays are electrons, the majority are ultra-ionized alpha particles (protons & neutrons) ejected from cataclysmic solar events (supernovas, pulsars, etc.).
Light is protons, not electrons, as well.
@IlovemyGlock21 He was also an accomplished Safecracker, a trick he picked up when working in Los Alamos.
What I mean to say is that he really drives the point home and makes you have one of those tripped-out moments... even if you're not high.
I could see him on a "Thinking Allowed" video since his fascination and granularity of understanding of science is so great it's spiritual.
@mooxim ~ the confusion I think is in you comprehension of the context of his saying "faster"... he refers to the oscillations, the "waves" . In that context, some waves oscillations are faster than others.
Children listening would be well put to hear it exactly as he said it, because the entire concept of "waves" to which he speaks is about the varying frequency (eg: relative speeds.)
@caltgelt No, the other guy is right - all objects are both particles and waves! There's something called the de Broglie relations that show that a wave-particle's wavelength is inversely proportional to its momentum. For any macroscopic object, the momentum is so big that the wavelength is incredibly small - hence no wavelike properties are observed. My wavelength is on the order of 10^-35 nanometers. Things like electrons, protons, and even buckyballs can be diffracted like waves, though!
Misread this one as "Stealing Things" and I was like "Ohhh something else that fascinates him"
He knew his final sentance was badass.
Thanks for your comment. Actually, microwaves ARE part of the electromagnetic spectrum. What I didn't know is that microwaves are part of the high-energy particles known as "cosmic rays". I dón agree though with the other fellow saying that everything is both a particle and a wave. I think there is some confusion there.
Neil Degrasse Tyson exudes this same enthusiasm toward science and I love them both for it. We need more of this zeal and fervor in teachers teaching at high school/elementary level. It would change a number of student's lives in a positive way.
Light is just an oscillating disturbance in this field which propagates forward. It's kinda hard to picture. This oscillating disturbance carries energy, and the energy it carries is directly related to how long is the distance from the crest to the trop of the wave. That is what we call wavelength.
So, for different wavelengths we get different energies, and different kinds of light. As you've learned from this video, the light we see is just a tiny fraction of it all.
@gocrimson10 I didn't know that, thanks. Having said that, when I look myself in the mirror I picture a whole bunch of particles put together, OK, in my case in a haphazard manner, but I don't picture a lot of waves. That's why I picture cosmic rays as particles, not waves. All in all, I think that it was a slip of the tongue on Feunman's case.
@leet512 light waves don't collide with each other, they can all travel in the same medium at the same time in any direction without interrupting each other. Try this experiment: put to mirrors parallel to each other, look at one of them close to a right angle, count how many repetitions of the same image you see and now think how many times light bounced before reaching your eye. Light bounces losing intensity depending on surface color or shape.
@LaserParody I have to admit that this isd the first time that I read "that light is protons." That goes against everything I have studied refarding electromagnetic waves!
If I were jumping into that pool I would be offended if Feynman would be thinking about how the bug sees things!
i love how he says "by the nature of the irregularites..." at 0:40
@paulnord he meant that some waves are long, some are short, some vibrate quickly, and some vibrate slowly. :D
1100 likes compared to one dislike. Only Feynman could command such a ratio.
@mooxim ~ After a good point of reference shift, I see what your saying there, if they were to equate the idea of a wave to the overall "surge" of light rather than the imperceivable amplitude cycle...
Woah!
That is the funniest comment I've read all day! Thank you!
Thanks a lot for posting this :)
In a vacuum, yes.
@caltgelt ~ no not really. the particles move in waves... the mass is the particle I.E.: an electron... we'll go with a microwave "magnetron (cyclotrons are similar, but harder to explain in truncation). Putting this in laymen terms, so bear with me.
As the current is fed into the magnetron chamber (terminate coil), they literally bounce back and forth in the chamber at a particular tuning for the frequency of those reciprocations. Microwaves are between 300M and 300G hz. If memory serves.
this gave me an acid flashback.
@JayGatsbyOdysseus Sound is just air vibrating in such a way that your ears find meaningful. There are no particles involved except the molecules in the air that are vibrating.
Light is of an entirely different nature. In some ways it behaves as it would if it were a particle, but then you study it some more and find out that it behaves as it would if it were a wave. In fact, as you said it is both.
How can this be? It's the nature of it. The inconceivable nature of nature!
They should show these clips to high school students to get them interested in math and science!
@LaserParody Pfeeew! For a moment I thought I was going bokers! .)
Checking what's "going on" by analyzing the waves that comes out of it...
'Who'd have thunk it'?
@Searching1981
One person can't comprehend the words that are coming out of Feynman's mouth.
Now i add to that my wifi, and the five other networks i pick up, all the mobile phones in my house and the cordless house phone!
@ararat123457 i cant believe people go to the movies while we could all listen to radio Moskou!
I think it's conceivable that one out of every thousand or so people might accidentally click the wrong thumb.
Thinking about using the information from the waves on the water to figure out everything about who dived in, when, and where.... it's actually a kind of simplistic explanation of the holographic principle as well. And I don't think the holographic principle was even properly known about when Feynman was alive.
@LaserParody yeah I just watched it again. he makes it fairly clear if you already know what he's talking about. I just meant that it might not be the best thing to show to children who haven't been introduced to frequency yet. Kids have a remarkable ability to take things in physics the wrong way. You have to be very explicit about what you mean. Although any good physics teacher should be able to explain what he meant if they did show this in class.
If we actually had teachers that was half as good & interesting as he is.. then I would've payed more attention in school, much more.
and in the radiowave medium, one of the reasons the FCC regulates unlicensed radio transmitters is because of their ability to interfere with the emergency channel broadcasts of other transmitters which could ultimately result in calamity
then you have heat waves rising off a hot tarmac that do interfere with and distort lightwaves resulting in "mirages"
and yet, the lightwaves of someone to his left don't seem to interfere with the lightwaves of someone in front of him... how can this be??
@0nfir3 Wow, thank you so much. That answered the quesiton perfectly lol.
This man has such a wonderful perspective on life.
@mooxim ~ we may have to agree to disagree here, because that IS exactly what he is saying, and it is exactly the case. Light WAVES are considered by their relative speeds.
Simply put (laser physics & stage/film lighting background):
Some light waves ARE indeed faster than others.
The LIGHT travels at a (was believed to be) constant speed - the oscillatory waves are a measure of speed.
Waves = varying speeds.
Insane!, I say !
I look forward to that. It is hard to follow, especially when he is writing on the board and you can't see what he is referring to. It would be a great community service to recreate some of the experiments he did, like the rubber band heat engine.
@caltgelt actually cosmic rays consist of (among other things) microwave radiation. these are indeed high-energy particles, tho we call them photons wich u probably already knew but microwaves are a type of electromagnetic wave.
Wow! "old man"? Richard Feynman?
Staggering in its concreteness.
I wish he were old! He's dead.
His mind is unique and he is child-like in his enthusiasm. That is so ageist.
I'd be honored if Richard Feynman thought about me! I'd also have adored Paul Newman in his 80's over some 20-or 30 year old idiot.
What does age have to do with it?
Wow--never occurred to me!
"We swivel this ball about so that the hole moves...."... sounds so damned creepy.
rectangular array of numbers
as an amateur scientist, the only explanation I can cobble together is that Tungsten filaments in light bulbs emit photon wavicles many times per second... at a rate so high that it appears to be continuous radiation to us
if 29.97 frames/second was a sufficient number for Hollywood to use for decades to give the appearance of continuous motion... then 1200 wavicles per second would certainly fool us into thinking the filament emissions were continuous
Good point, although at this moment I'm feeling more like a particle. :)
Me a wave.
@paulnord I think by "slower" he meant lower frequency.
i wish you could ask him this question. wonder if there was any mercy left....
A minor point: cosmic rays are not "rays" as suich, i.e., they're not electromagnetic waves but high-energy particles.
keep clicking the play bar at 4:07 for some pirate action
@caltgelt Wave-particle duality: Everything is both :P
yes it is quite baffling that somebody to his left can see somebody to his right with no visual interference or distortion... this has never made sense to me and I wonder if somebody could explain to me how it is possible??
for example in the medium of water high amplitude crests and troughs can certainly interfere and distort other waves that they happen to come in contact with
makes you wonder what else is there
I wish this guy helped to explain the 10 dimensions video which is floating around on youtube.
Light is an electromagnetic wave. However, it is also a particle, a photon. Physicist can explain how it is both but it is. Is sound also a wave and a soundton?
Who did it? Who disliked this!?
the ugly girl in the swimming pool
@jangofet555 the question I would have is how these waves know what to do and how to do it :p
@mooxim he meant greater frequency...
But you gotta stop and think about it to really get the pleasure about the complexity - the inconceivable nature of nature.