This is so interesting. I remember studying about Einstein's and Planck's work on energy last year in school, and never understood a thing, but now things do be making sense. I really wish schools taught us the way you do :(
Things are making sense now because you studied it in school the first time. Also he is trying not to go to details so that his viewers won’t be confused, but in school teachers are required to explain in details.
@@sujanaryal833 but aren't we supposed to understand things better when things are explained in detail ? I understand what you're saying, but here's the jam...some of the teachers in school don't bother to teach us with the heart of parting knowledge, they do just as much as it's needed for them to keep their job and earn their livelihood, leading up to why we lose enthusiasm in the subjects we were once excited about, which then leading to ignoring the subject and then hating it. It's basically how an average student's brain work. But here, without even getting to the details, James is able to explain complex stuffs easily...and I really really appreciate that.
@@sujanaryal833 quite the opposite; on youtube educators are able to snag some additional cash by going into far more detail on smaller minutiae then educators in the classroom. I mean really, an entire video on the ultraviolet catastrophe! This is compared to a passing mention in an single line and an expectation to memorize planks constant and Inuit where it came from that I received, twice one in a collage another a university! (And the damn formula was wrong one of those times)
@@allhumansarejusthuman.5776 Its just because he makes learning fun. School can get pretty boring when all you do is read and study textbooks and then do the same at home and sure it might get the job done but it leaves you hating the subject. I used to hate reading because they would force me to and even after they stopped forcing it I still had the stigma and I didnt read a book for years. Theyre obviously doing something wrong if we end up hating the subject we're learning.
I really like this video! I know the video would get longer if you explained Kt, Einstein's photovoltaic effect for which he won the Nobel prize, since you already went into the rest of the equations it seems crucial to motivate what Planck did with his equations to match experiment... maybe you can cover that in another video? I'm not a physicist, so your explanation helped me better grasp the problem that needed to be solved and there was just enough detail to get the gist of the equations... it's not your usual "what happens when you put soap in a magnetic field and suck all the air out" LOL... it's good once in a while to have a high school / college level video... it stimulates my mind and helps me understand the world better. Thanks!
One correction... energy itself is NOT quantized, or at least there is no evidence that it is. For example, if you take a laser and measure it's frequency at various heights relative to the emitter, the frequency shifts linearly as the laser loses energy climbing out of the gravity well. Not quantized. Same with red shift and blue shift. And the same with the E-M field itself. What is quantized are interactions, and that quantization is primarily due to the fact that electrons can only change orbitals in discrete steps. At least until they are physically ejected and become free electrons. If you take E = n * h * f, it is true that (n) can only be discrete integers. But what people forget is that (f) has no such restriction. -Matt
How would a person with very limited knowledge of this topic but absolute admiration begin studying quantum physics, but studying it on a lower level, where they can begin to break down the language and increase there knowledge of the topic out of curiosity and personal growth? I have looked but it's all at a level to high for beginners, what is ground level or stage 1 in this field?
Wait, if you heat anything aren't you giving kinectic energy to its atoms/molecule and they re emitt it ? Even if the electron-jumping-phenomenon is also happening why are we not accounting the former ?
So why does stars emit UV and x-ray then you see the whole fallacy of quantum falls apart so easily because the universe disproves it anytime you just look at it
When in a proper school setting teachers typically go a bit more in depth because it isnt enough to know how math works, but to UNDERSTAND why it works. This is more casual learning imo. Very good tho, hes an awesome youtuber.
You should be awarded some highly extraordinary award for all this, what you do. I am 52, but I never felt that much experimentalist in my life, as I do now, after watching your videos all the time. there are several things that I came to know in your videos, even after being a senior science teacher my whole life. I think everyone owes you alot of respect, and whatsoever you need for making your videos. I've been watching you throughout the entire pandemic till now, but i am commenting only now. Sorry for that. I will do anything for you, just ask.
Hey Action Lab! Something I want to know: They say that blue light interferes with sleep. What about people that are colorblind to blue light frequencies--does blue light interrupt their sleep patterns?
If I recall, a special blue light kills eye cells and that has nothing to do with being colorblind. They transfered this gene on other type of cells (not from the eye) and we're able to explode any cells they made. It doesn't do something to your sleep, it's turning your blind.
"Planck’s Route to the Black Body Radiation Formula and Quantization" by Michael Fowler details Planck's thermodynamic analysis of the entropy of Blackbody Radiation, which motivated his frequency-dependent hypothesis to satisfy Wien's Law at high frequencies. Planck's application of Boltzmann's Statistical Mechanics led to his conclusion that the material of the walls emit and absorb radiation in discrete quanta. It's a great read.
What an exquisite explanation. You are one of the topmost gems of youtube and have a real knack for teaching. Can't believe you started with run of the mill hydraulic press videos and ended up here! Glad YT worked out for you.
I want to ask why they call it catastrophe.... Is it because it breaks the expectations of the classical physics?... Or the catastrophic effects of UV... X_RAY... & GAMA RAY'S...?
"Ultraviolet catastrophe" aka me the first time I dyed my hair and used Splat For those looking to dye your hair, I recommend Ion and Lyme Crime. I loved Arctic Fox until I learned the owner abuses her animals :/
@@alex_marie1324 Noooooo why does everyone whose products I like turn out to be shitty?!?! Thank you for telling me. I plan on looking into Hayley Williams's brand since I know she's cool and I've heard good things. Ugh, I was really starting to love Lime crime. That's a shame
Plank suffered through a multi-year crisis of confidence before publishing this and was extremely unhappy with it. He considered this math to be a temporary 'fudge' or work-around and fully expected it to be superseded by 'real' physics in the future. Years later, he was dismayed that this had become doctrinal. The core problem is that energy is a mathematical abstraction, something we invented to help us understand and talk about the real physical world (of properties, fields & forces), and that has proved remarkably useful in cross-disciplinary contexts; however, it is always and everywhere a function of other real, measurable, physical fundamentals (try buying a 'pure energy' meter!) and so we've manipulated it to the limit pure mathematics allows. GREAT video BTW, as usual for this channel.
Out of all the times I have watched this guy. After watching this one I wish I kept at math. This really had me interested and wishing I knew more. My last successful math class was trig and I loved it (the way it was taught made it fun and me wanting to know more) though calculus was my breaking point. It stopped being fun. So, bravo ActionLab.
So, how would those quantum effects appear to us on a larger scale, if the Plank's constant was much bigger? Like the heating body would be blinking/flickering?
Wouldn't you get the same results / same colours if you just heated up the metal place without having the blackbody radiator? It seems like all we're doing is seeing the metal plate heated up glowing, behind the hole.
Thanks to this excellent explanation I finally understand the spectral distribution of the black body radiation. The Action Lab has helped me where all the other UA-cam videos did not. Thanks again!
It was helpful to see a black body box. I could never understand why planks contemporaries had to have such an idealized analog. Couldn't they use a metal tube closed at one end? They could heat the closed end and peer down the open end. The sides would reflect enough radiation inward and the light would shine in the darkness. You can try that if you want. Please show us why the silly box was preferred . Thanks!
IF YOU PUT THE FORMULA ASIDE, THEN WHAT IS THE INTUITIVE reason BEHIND the math so one can SEE the intensity going down on higher frequencies, I mean conceptually?
Great video! But I still have a doubt here, why does the curve bend at the shorter wavelengths? How is the particle nature of light elucidating the bending of the curve?
So, temperature, color and EM spectrum are the same thing, phisically? Why the red light is visibile at roon temperature, even it correspond to a lot of heat?
It started out strong but it fizzled out at the end and I still don't know why we don't see more UV light 😞. I also don't see the connection between planks law and the quantization of energy levels. The law looks continuous to me. I love the experiments but the explanation of the theory is a little handwaved.
the graphs that you draw on the board are confusing (4:10) and (4:42) ....the whole explanation is confusing. You have to start by explaining that according to boltzman the energy is spread evenly on all frequencies, that's why your intensity graph is wrong, it should be a flat line, intensity only goes to infinity if the horizontal axis is wavelength, not if it's frequency
I enjoyed this and learnt something. You were so much better years ago than now. I guess because you’re more going for the clicks and views now, for your sponsors. That’s how the whole youtube science community is deteriorating, not only you. Keep up the *good* work.
Stil didn't understand this. Too much of jargon. And buddy plank. He was like do any steps in the math a math but match the answer should match with what the nerd got. Lol.!! Science is like this or maybe was like this. May assumptions. World is mesmerizing.❤️👍
There is fraud in Planck's law. The average energy of cavity is constant, while they treated it as variable. The term in exponential hf, here f is constant, fundamental frequency. So average energy term is constant, then it as lame as Rayleigh-Jeans model which have average energy as constant, kT. There are other laguna where they multiply f in average energy term as constant as variable. Though this doesn't effect on shape but size, intensity increases. Also approach in quantum is more classical than classical, because here energy of particles is constant, in fermi-dirac and bose-einstein, while maxwell-boltzmann has different energy.
It seems like classical physics is only good when the temperatures are not extreme. Too much heat, and classical physics breaks down. Not enough heat and classical physics breaks down again. I watched this video several times to get a better understanding.
Love that end shot, you're blocked by 2 thumbnails, the right side has the Action Lab channel logo, and the middle part is just an empty square of white board, great exposition! haha
i didnt watched. i think yes, it will glow hot. the aspect of perfect absorber of light dosent mean the surface are able to heat until it start to emit radiation in heat form. think like a pencil lead, it is black, and still glows. EDIT: "dosent mean the surface are *not* able to ..."
Am I right in thinking that there should be a cascade of photon releases which degrades gamma rays into x-rays and then microwaves and so on through the electromagnetic spectrum?
I always thought that there was an absolute maximum temperature, just like you have an absolute zero temp. Due to planck's length being the smallest possible length, if the temperature of an object increases, so does the frequency of the emitted radiation, and the wavelenght becomes smaller. And thus when you add enough energy, you will in theory reach a wavelength that is equal to planck's length and that is the hottest an object can ever be. Now after watching this video, must I conclude that the frequency of the emitted radiation of an object in real life does not increase proportionally with the temperature of the object? Energy of photon=E=hc/wavelength of photon
Poor explanation that had to resort to math equations and lost 99 percent of your students. Never resort to math equations in the beginners explanation. You also did not explain why the graph decreases at higher frequencies. In the classical picture, all vibrations of electrons are allowed. So increasing the intensity will produce more and more vibrations and corresponding large increase in light energy given off at high frequency (UV wavelengths). In reality, only certain vibrations are allowed, and vibrations that lead to UV emission are much less likely to occur, since they require specific high energies to achieve. That is, no matter how much low energy you put in to the system, you cannot get that high frequency vibration to occur that will emit UV photons. A rough analogy is hitting a pendulum with baseballs. Classically you can throw a bunch of slow baseballs at it and eventually you'll get it to swing really high. In quantum mechanics this won't work, no matter how many baseballs you throw it won't swing, until you hit it with a baseball with exactly enough kinetic energy to get it to swing at a certain rate.
Black body radiation is producing electromagnetic waves of any frequency, not just the resonant mode that a given atom have, the spectral lines. This is because of spreading of the lines caused by Dopler effect. When an electron return to a lower energy level, it emit a fixed frequency. But that frequency is red shifted if the atom was moving away from the observer at emission time. The hotter the object, the higher the frequency. But also, higher temperature make the atom vibrate more violently, so the widening of the spectral line is greater.
This is so interesting. I remember studying about Einstein's and Planck's work on energy last year in school, and never understood a thing, but now things do be making sense. I really wish schools taught us the way you do :(
Yep
Things are making sense now because you studied it in school the first time. Also he is trying not to go to details so that his viewers won’t be confused, but in school teachers are required to explain in details.
@@sujanaryal833 but aren't we supposed to understand things better when things are explained in detail ?
I understand what you're saying, but here's the jam...some of the teachers in school don't bother to teach us with the heart of parting knowledge, they do just as much as it's needed for them to keep their job and earn their livelihood, leading up to why we lose enthusiasm in the subjects we were once excited about, which then leading to ignoring the subject and then hating it. It's basically how an average student's brain work.
But here, without even getting to the details, James is able to explain complex stuffs easily...and I really really appreciate that.
@@sujanaryal833 quite the opposite; on youtube educators are able to snag some additional cash by going into far more detail on smaller minutiae then educators in the classroom.
I mean really, an entire video on the ultraviolet catastrophe!
This is compared to a passing mention in an single line and an expectation to memorize planks constant and Inuit where it came from that I received, twice one in a collage another a university!
(And the damn formula was wrong one of those times)
@@allhumansarejusthuman.5776 Its just because he makes learning fun. School can get pretty boring when all you do is read and study textbooks and then do the same at home and sure it might get the job done but it leaves you hating the subject. I used to hate reading because they would force me to and even after they stopped forcing it I still had the stigma and I didnt read a book for years. Theyre obviously doing something wrong if we end up hating the subject we're learning.
I really like this video! I know the video would get longer if you explained Kt, Einstein's photovoltaic effect for which he won the Nobel prize, since you already went into the rest of the equations it seems crucial to motivate what Planck did with his equations to match experiment... maybe you can cover that in another video? I'm not a physicist, so your explanation helped me better grasp the problem that needed to be solved and there was just enough detail to get the gist of the equations... it's not your usual "what happens when you put soap in a magnetic field and suck all the air out" LOL... it's good once in a while to have a high school / college level video... it stimulates my mind and helps me understand the world better. Thanks!
"Blinded by the Light" ~ Manfred Mann's Earth Band
This is what I learned in my 7 physics lectures.....and you revised it in 8 minutes awesome
It absorbs everything like an acoholic
Huh? I don’t get that.
But maybe...It absorbs everything, unlike an alcoholic’s liver...
Wow
It absobrs everything liek a acoholic
Wow...its like the practical explanation of what i studied in quantum physics. 😎
Please make a longer video on this. I actually understand it from you.
Dude I wish I had seen before, such an amazing explanation
One correction... energy itself is NOT quantized, or at least there is no evidence that it is. For example, if you take a laser and measure it's frequency at various heights relative to the emitter, the frequency shifts linearly as the laser loses energy climbing out of the gravity well. Not quantized. Same with red shift and blue shift. And the same with the E-M field itself.
What is quantized are interactions, and that quantization is primarily due to the fact that electrons can only change orbitals in discrete steps. At least until they are physically ejected and become free electrons.
If you take E = n * h * f, it is true that (n) can only be discrete integers. But what people forget is that (f) has no such restriction.
-Matt
No duct tape or paper was harmed in the making of this video....because it was only theoretically 750°C.
Put the polen and stigma of a flower together and show changes
How would a person with very limited knowledge of this topic but absolute admiration begin studying quantum physics, but studying it on a lower level, where they can begin to break down the language and increase there knowledge of the topic out of curiosity and personal growth? I have looked but it's all at a level to high for beginners, what is ground level or stage 1 in this field?
Einstein got a nobel prize for that dicovery
I wish you were my science teacher at school !
Good example for straight thinkers, highly intellectuals, natural intelligence and pure intelligence.
This is the way I wanna learn
7:35 also the f can have any decimal points you want. But then its another "colour"
It isn't clear to me why the Plank's law equation is said to only have discrete values for f, it looks like f can still be anything in the equation.
would there be such thing as white body where it will completely reflect all light like a mirro maybe?
I saw this when it was 1 minute ago :D amazing vid btw
Wait, if you heat anything aren't you giving kinectic energy to its atoms/molecule and they re emitt it ? Even if the electron-jumping-phenomenon is also happening why are we not accounting the former ?
Is spacetime a blackbody radiator?
Does this mean there's a finite number of visible colors? 🤔
Ninth, loved your videos 👍
Gg for 9th
Yes
So why does stars emit UV and x-ray then you see the whole fallacy of quantum falls apart so easily because the universe disproves it anytime you just look at it
why and how does he explain quantum physics easier than school teachers explaining addition and subtraction
I think because he explains in in laymen
When in a proper school setting teachers typically go a bit more in depth because it isnt enough to know how math works, but to UNDERSTAND why it works. This is more casual learning imo. Very good tho, hes an awesome youtuber.
Cause he is PhD in chemistry and surely an enthusiast
Facts
Nope nope nope he is just not getting paid for student torture
When you move past ultraviolet light, you run into "ultraviolent" light :D
Plays Doom Ultraviolence
Doomguy! :o
You should thank god dislikes dont show up, mr. punny
that's deep man
You should thank god cats cant fly@@skyrat1896
Me: *Needs food*
My brain: *Needs Action Lab*
There is nothing
Really nothing in here
Why are you trying
Ok you almost there
Just there
\/
\/
May your parents live for more than 100 years
Thank you
Hello fellow cuber
Hi cuber
@@shezacuber6092 Hi
@@sherwin-speedcuber2060 Hi
You should be awarded some highly extraordinary award for all this, what you do. I am 52, but I never felt that much experimentalist in my life, as I do now, after watching your videos all the time. there are several things that I came to know in your videos, even after being a senior science teacher my whole life.
I think everyone owes you alot of respect, and whatsoever you need for making your videos. I've been watching you throughout the entire pandemic till now, but i am commenting only now. Sorry for that. I will do anything for you, just ask.
Hey Action Lab! Something I want to know: They say that blue light interferes with sleep. What about people that are colorblind to blue light frequencies--does blue light interrupt their sleep patterns?
Tritanopia is extremely rare, so it would be pretty difficult to study, but maybe.
Good question
If I recall, a special blue light kills eye cells and that has nothing to do with being colorblind. They transfered this gene on other type of cells (not from the eye) and we're able to explode any cells they made.
It doesn't do something to your sleep, it's turning your blind.
I think that;s a myth now.
My dad is color blind and blue light doesn't affects his sleep so I'll say that the answer is no.
*WHAT IF YOU HEAT UP THE WORLD'S DARKEST MATERIAL?*
*IT'D WARM UP*
Plot twist: there is no material.
@@brando3342 *LOL*
Md Tarequzzaman Are you sure about that.
@@anantakabir8390 *DUNNO*
Nice summary of blackbody radiation! I remember doing this in my bachelors in the course Statistical Physics. One of the more difficult courses we had
"Planck’s Route to the Black Body Radiation Formula and Quantization" by Michael Fowler details Planck's thermodynamic analysis of the entropy of Blackbody Radiation, which motivated his frequency-dependent hypothesis to satisfy Wien's Law at high frequencies.
Planck's application of Boltzmann's Statistical Mechanics led to his conclusion that the material of the walls emit and absorb radiation in discrete quanta.
It's a great read.
What an exquisite explanation. You are one of the topmost gems of youtube and have a real knack for teaching. Can't believe you started with run of the mill hydraulic press videos and ended up here! Glad YT worked out for you.
Fun fact: im actually copying someone with this comment
@@gaiusjuliuscaesar3173
Tumhara baap Binod
Please notice my comment,
Can the cement dry in space?
I want to ask why they call it catastrophe.... Is it because it breaks the expectations of the classical physics?... Or the catastrophic effects of UV... X_RAY... & GAMA RAY'S...?
Hmm, I think that explanation ended rather abruptly.
I had the same thought, i felt like i was just getting into it and then it ended.
It ended just like that curve that drops in the ultraviolet region 🤷
The ultraviolet catastrophe graph seems just weird when plotted against frequency instead of wavelength
You summarize what many teachers and profs fail to summarize in a whole semester. Modern classroom education is dead, all teachers should be fired !!
The creation of the planc constant was, according to Planck, the act of greatest despair. :)
He basically forced his equation to work
Physics
I saw this when it was 1 minute ago :D amazing vid btw
I love ur name
Technoblade's secret account?
FuriousPhoenix mabye😏
7:05 why n=2,3,4 i don't understand it 😢 please sir explain 😢
Funny how this makes perfect sense
Not to me 😅
😭
i dont get it! how is less UV related to quantizing ??? why the curve goes down when quantized ??
Fun fact : only 1 person can be first not 10 ppl
Exactly I was second to type first so I’m second
i disagree.
First
I
L
i am big brother of binod😅😅😅😅😅😅😅😅 from nepal
_
___
_____
______
"Ultraviolet catastrophe" aka me the first time I dyed my hair and used Splat
For those looking to dye your hair, I recommend Ion and Lyme Crime. I loved Arctic Fox until I learned the owner abuses her animals :/
Lime crime’s owner is bad too :( but can relate to the splat disaster
@@alex_marie1324 Noooooo why does everyone whose products I like turn out to be shitty?!?! Thank you for telling me. I plan on looking into Hayley Williams's brand since I know she's cool and I've heard good things. Ugh, I was really starting to love Lime crime. That's a shame
wow way interesting
Thanks for making this video I could see the practical of what is studied yesterday
Same here
What the hell? Just 2 minutes ago there were 3 comments. Dame da ne
Plank suffered through a multi-year crisis of confidence before publishing this and was extremely unhappy with it. He considered this math to be a temporary 'fudge' or work-around and fully expected it to be superseded by 'real' physics in the future. Years later, he was dismayed that this had become doctrinal. The core problem is that energy is a mathematical abstraction, something we invented to help us understand and talk about the real physical world (of properties, fields & forces), and that has proved remarkably useful in cross-disciplinary contexts; however, it is always and everywhere a function of other real, measurable, physical fundamentals (try buying a 'pure energy' meter!) and so we've manipulated it to the limit pure mathematics allows. GREAT video BTW, as usual for this channel.
Out of all the times I have watched this guy. After watching this one I wish I kept at math. This really had me interested and wishing I knew more. My last successful math class was trig and I loved it (the way it was taught made it fun and me wanting to know more) though calculus was my breaking point. It stopped being fun. So, bravo ActionLab.
"Converts a cardboard box into perfect black body"
that Huggies box: - "Hey i am no joke"
This is thaught in 11th grade in indian school😂
ay evrybody if ur not frm india then ur a stupid person! India numbre Oen!
The action lab : the whole numbers start from 1
Natural numbers : who the hell am I??!! 😡😡
He meant whole numbers as in the real numbers with a denominator as 1
@@gamingwithdeku9992 0/1 -1/1
if we put zero(0) then the whole multiplication will become zero and the equation will give answer as zero, which is non sense
Like your videos from surat gujarat India 👍👍👍
Gg for 5th
So, how would those quantum effects appear to us on a larger scale, if the Plank's constant was much bigger? Like the heating body would be blinking/flickering?
*HE TAUGHT ME MORE THAN MY SCHOOL*
Do Sulfur hexafluoride under water
Wouldn't you get the same results / same colours if you just heated up the metal place without having the blackbody radiator? It seems like all we're doing is seeing the metal plate heated up glowing, behind the hole.
Please give me a heart.26th viewer.
Thanks to this excellent explanation I finally understand the spectral distribution of the black body radiation. The Action Lab has helped me where all the other UA-cam videos did not. Thanks again!
It was helpful to see a black body box. I could never understand why planks contemporaries had to have such an idealized analog. Couldn't they use a metal tube closed at one end? They could heat the closed end and peer down the open end. The sides would reflect enough radiation inward and the light would shine in the darkness. You can try that if you want. Please show us why the silly box was preferred . Thanks!
IF YOU PUT THE FORMULA ASIDE, THEN WHAT IS THE INTUITIVE reason BEHIND the math so one can SEE the intensity going down on higher frequencies, I mean conceptually?
I love your Way of teaching
Like very friendly cool.
Non exaggerated.
Very Impressive. 👏👏👏👏👏🤗
Imagine using this as a wallpaper in your room.
The best explanation!
Great video! But I still have a doubt here, why does the curve bend at the shorter wavelengths? How is the particle nature of light elucidating the bending of the curve?
So, temperature, color and EM spectrum are the same thing, phisically? Why the red light is visibile at roon temperature, even it correspond to a lot of heat?
Hellow action lab,
Can you please predict what would be happening when th planets move in the speed of an electron
Great explanation. It took only 8 minutes to explain the Ultraviolet Catastrophe.
It started out strong but it fizzled out at the end and I still don't know why we don't see more UV light 😞. I also don't see the connection between planks law and the quantization of energy levels. The law looks continuous to me.
I love the experiments but the explanation of the theory is a little handwaved.
the graphs that you draw on the board are confusing (4:10) and (4:42) ....the whole explanation is confusing. You have to start by explaining that according to boltzman the energy is spread evenly on all frequencies, that's why your intensity graph is wrong, it should be a flat line, intensity only goes to infinity if the horizontal axis is wavelength, not if it's frequency
Nice video and presentation.
Remember that curve fitting is black box modeling but science.
Could you please explain, why does hot BB emit contineous frequency of electromagtic radiation while gas discharge tube emits discrete frequency.
I enjoyed this and learnt something. You were so much better years ago than now. I guess because you’re more going for the clicks and views now, for your sponsors. That’s how the whole youtube science community is deteriorating, not only you. Keep up the *good* work.
LOL. Careful playing with that absolute black stuff. Anish Kapoor is going to come after your ass... although Stuart Semple has got your back.
Stil didn't understand this.
Too much of jargon. And buddy plank. He was like do any steps in the math a math but match the answer should match with what the nerd got. Lol.!! Science is like this or maybe was like this. May assumptions. World is mesmerizing.❤️👍
The Ultraviolet Catastrophe very nicely explained!
Thank you!
There is fraud in Planck's law. The average energy of cavity is constant, while they treated it as variable. The term in exponential hf, here f is constant, fundamental frequency. So average energy term is constant, then it as lame as Rayleigh-Jeans model which have average energy as constant, kT. There are other laguna where they multiply f in average energy term as constant as variable. Though this doesn't effect on shape but size, intensity increases. Also approach in quantum is more classical than classical, because here energy of particles is constant, in fermi-dirac and bose-einstein, while maxwell-boltzmann has different energy.
The Action Lab video with a word "catastrophe" in the title... Must.... Click.... Immediately....
It seems like classical physics is only good when the temperatures are not extreme. Too much heat, and classical physics breaks down. Not enough heat and classical physics breaks down again. I watched this video several times to get a better understanding.
Love that end shot, you're blocked by 2 thumbnails, the right side has the Action Lab channel logo, and the middle part is just an empty square of white board, great exposition! haha
i didnt watched.
i think yes, it will glow hot. the aspect of perfect absorber of light dosent mean the surface are able to heat until it start to emit radiation in heat form.
think like a pencil lead, it is black, and still glows.
EDIT: "dosent mean the surface are *not* able to ..."
Am I right in thinking that there should be a cascade of photon releases which degrades gamma rays into x-rays and then microwaves and so on through the electromagnetic spectrum?
Wish you would be my science teacher
I always thought that there was an absolute maximum temperature, just like you have an absolute zero temp. Due to planck's length being the smallest possible length, if the temperature of an object increases, so does the frequency of the emitted radiation, and the wavelenght becomes smaller. And thus when you add enough energy, you will in theory reach a wavelength that is equal to planck's length and that is the hottest an object can ever be.
Now after watching this video, must I conclude that the frequency of the emitted radiation of an object in real life does not increase proportionally with the temperature of the object? Energy of photon=E=hc/wavelength of photon
Sorry trying to find a bucket to catch my brain leaking out of my ear lol
I understood everything, except 'how is a hole a black body, when you keep a light emitting metal just behind it'.
Thank you.
How does plank equation plot to the real life graph? Can u explain pls?
That e = n*h*f came out of a process we call it curve fitting. That curve fitting is mathematics but science.
can this not be explained with harmonics as we are dealing with wave forms?
Poor explanation that had to resort to math equations and lost 99 percent of your students. Never resort to math equations in the beginners explanation. You also did not explain why the graph decreases at higher frequencies.
In the classical picture, all vibrations of electrons are allowed. So increasing the intensity will produce more and more vibrations and corresponding large increase in light energy given off at high frequency (UV wavelengths).
In reality, only certain vibrations are allowed, and vibrations that lead to UV emission are much less likely to occur, since they require specific high energies to achieve. That is, no matter how much low energy you put in to the system, you cannot get that high frequency vibration to occur that will emit UV photons.
A rough analogy is hitting a pendulum with baseballs. Classically you can throw a bunch of slow baseballs at it and eventually you'll get it to swing really high. In quantum mechanics this won't work, no matter how many baseballs you throw it won't swing, until you hit it with a baseball with exactly enough kinetic energy to get it to swing at a certain rate.
i watched so many videos on this but this was by far the one that actually made the most sense to me. Thank you!
Good experiment and very nice experiment
Black body radiation is producing electromagnetic waves of any frequency, not just the resonant mode that a given atom have, the spectral lines.
This is because of spreading of the lines caused by Dopler effect.
When an electron return to a lower energy level, it emit a fixed frequency. But that frequency is red shifted if the atom was moving away from the observer at emission time.
The hotter the object, the higher the frequency. But also, higher temperature make the atom vibrate more violently, so the widening of the spectral line is greater.