What's the difference between a board and a plank? Boards can change, but Planck's constant.

I love physics

I definitely want to start a rock band and name it the Ultraviolet Catastrophe.

My favorite part of this is Einstein's role in explaining Planck with the Photoelectric Effect, arguably the basis of quantum mechanics. In a sense, Einstein was the father of quantum mechanics, as he clearly was of relativity. Yet many people maintain that he either failed to understand it or rejected it, even though he was one of the core creators of the field and its theories.

"When you switch a plus to a minus" lol true, or adding a random natural log somewhere to make something line up with the graph

Snatoms!

Came for my physics homework, stayed for the hair.

In fact Max Planck did realise what he did immediately. He felt deeply depressed about it, but did it anyway. He indeed quantified light.

I live just up the road from Lord Rayleigh's home in Terling, Essex, UK, and it's great to see the recognition of his work, explained briefly, but perfectly. For the record the double noble prize winners observatory, and laboratory is still there untouched, left as he left it in 1919. Keep up the great work, and get the youth fascinated about the physical world.

Yay, I loved this! And the message at the end about being wrong is one of those things people don't like to emphasis about science but it's crucial.

Just revisiting to experience the amazing videos again with Physics Girl. Hope that she will recover from longcovid soon. Hope to see you soon in full swing!

Hi. I am several years late to the party, but this blonde-blue hair is absolutely flawlessly perfect. I also like the enthusiasm and happyness in these older video. Newer ones are imo more "scientific", more concrete, less broad so the topic is told more precisely and the professional level is higher there, but this older inner fire was just somethin' else.

beautiful video :) love the new hair! Purple suits you ;)

This is a fun video, but to go deeper only welcomes confusion. 6 Quark formations determine all the atoms in our universe. Quantum Mechanics is difficult to explain to the laymen. The Bohr model of the atom is, indeed, outdated. The electrons do not "orbit" the atomic nucleus, and it takes a few years of physics education to explain why. Planck's number is a number that is taken into account only with the understanding that how it is used is in such a way as to say, "the more we discover, the less we know." Prior to the Hubble discovery of the Andromeda Galaxy, Einstein believed our galaxy was the universe; and he was THE premiere physicist of his time. So I liked the ending of this video. Science is the search for truth. It changes because of new discoveries and calculations. It's a fun ride which many embark, but when it's wrong, Science has no problem admitting it and then moving on to a clearer truth. This video was much better than the crap posted weeks ago concerning "5 easy Science tricks you can use to fool your friends." That wasn't the verbatim title, but rather the direction. Press minds; don't impress for clicks. Thank you.

This video is excellent, all the way around. Production, ease of understanding, visual aids, humor, seriousness, depth of content, and length. I greatly appreciate the work put into this, Thank You ALL!

Still one of my favorite videos... So simple, yet so precise explaining such a relevant concept...

the speedo on my car was broken so I took it to my local quantum mechanics, now I can't find the car

Anyone else think she needs to add red to the top of her head with green and yellow part way down?

One glorious highspeed journey through the history of quantum mechanics. Great and thank you! I'm missing Neils Bohr in the story, but nice to get Lord Raleigh and the ultraviolet catastrophe, i never heard actually something interesting on that before. Very nice and admirable how you jump around like a superexited ultraviolet quantum! Exciting and educational video!

I'm so happy, I've been given this video to watch for my A levels, to further myself in education I need to watch a KZfaq channel I enjoy... Incredible

Your hair is so dope!

Ultraviolet... Hey, your hair's extremely violet, or, may I say, ultraviolet?

I love you, Physics Girl! Nice video. I would love to see more of QMs.

As always, great video. I've been hooked on your vids since the very first one I saw. Keep up the good work and I've got to say it, love the hair.

Ultraviolet Girl

Don't black holes absorb (obviously) emit (hawking radiation) and doesn't reflect?

You explained this better than 90% of the other videos I found. Thank You

1:48 - So, in 100+ years we have moved from the silliness of things being made up of things vibrating like springs to our more enlightened view of things being made up of things vibrating like strings.

The pacing in this video is 10/10! Awesome video :) out of curiosity did you starting making the video before or after your got the new hair colour? :P

So when am I going to able to use a quantum computer to run crysis?

Your channel is great. I enjoy the geekiness of your enthusiasm for science and sharing science. Thanks!

Quite informative video and very simple to follow. Thank you. Keep up the awesome work you're doing.

OMG She used Snatoms at 1:48!!!!

There is some great editing in this video. And the material was really interesting too! I had no idea that Planck's quanta was just a lucky accident.

This is the greatest thing. So excited about your videos!

This is by far the best video physics girl..I would love to see more of your videos like this by starting from history of science to its present state..Great fan of you by the way..Keep rocking and physicing...

I understand why her hair relates to physics.

Physics girl, what sort of audience do you make your videos for? High school kids, uni undergraduates, or junior school?

I have so much respect for you, PhysicsGirl! :) You're awesome!

You are so helpful, you really have a talent for explaining so all can understand. Thank you

A refreshingly different way of looking at physics! I wish I could give it 10 thumbs ups.

Thank you, Dianna for creating these amazing videos, for me it's like iTunesU physics video lectures but in more compact format -:) I hope I'll being able to hook up my daughter on your videos to get her interested in physics before she will be having her Physics classes next year -:)

THANK YOU!! I’ve been looking for a good video that thoroughly explains this for hours. Just in time for my test

Always enjoy your videos... Thank You.

Thanks Dianna, this will help me with my chemistry tests. Nice UV hair!

your hair makes you look hot... no, really, it looks like a 11000k black body

@physicsgirl i just want to say your are a great inspiration to me im a senior in hs and im about to go to college for physics and i just want to say thank you so much for all you do

Thank you for sharing your work!!

You know, in light of that really idiotic Cape Town 'decolonize science/science must fall' video that was trending recently, this is a really fantastic episode. Science is much deeper than facts and theories. It is a frame of mind. *When the observation does not match the theory, one changes the theory NOT the observation.* And this is an idea I've carried over to other parts of my life. For example: when someone presents facts and statistics that challenge my deeply held beliefs and narrative, my beliefs/narrative has to change NOT the facts. Because in the pursuit of truth, one should put aside ego, irrationality, and presuppositions for repeatable, observable, and objective answers. And that's something that those UCT students could use in spades.

That "what ever.. Physicists" had me laughing.

This made me fall in love with Physics all over again. Thank you.

Love this channel. Learning new things is awesome.

Great video! Actually, the "many worlds" interpretation of quantum mechanics is fairly intuitive. It's pretty much the only one that is sensible. E.g. it's not that the electron gets locked down to a single position when you measure it, but you and your measuring equipment get "entangled" with the electron, so you only observe the electron at that specific location. The electron still exists at its other possible locations, but you can't observe it.

At 37°C, she's glowing hot! 😍

Cleared my doubts! Thankyou so much.

The term "Ultra-violet Catastrophe" was first used by Paul Ehrenfest in 1911 talking about the Rayleigh Jeans law from 1905 and his attempts from 1903 to 1906 to solve the blackbody radiation problem using classical physics , Planck's work is from late 1900, but Planck was aware of a first try from Rayleigh from early that year (in 1900). So the catastrophe was solved before it was discovered... It was more like the desperation from those who couldnt accept the new quantum approach of physics. But i guess it wouldnt make a catchy soundbyte...

"Science isn't fixed facts", glad you said this. Religious fanatics always try to point out how science can be wrong and I'm always like "well duh."

Lol i we just overd this in our A Level Physics Class

As always, an awesome video. Please never stop making them and, I love the hair, 😍. I really enjoy your work and continue to tell as many people that i can to, at least, let their children watch something good for them.

Nicely done and so positive. I bookmarked that right away in my motivational folder!

somehow it's not until 5 minutes-in that i notice the hair color.

If I could get a cookie every time I was wrong... I would have black hair. -Quantum Physics

Really great! Clear and funny as well. I'll show it to my students!

Oh, Dianna, you're so adorable and the questions you make us think about are really amazing. Physics is one of my favorite subjects and you explain it with such grace, humour and simplicity, although the complexity of nature.

You're a treasure Dianna! (Physics 101 lessons are just over so I'm re-watching the old Physics Girl's stuff)

Love the hair! I fully support hair colors in the heigh frequencies.

Tbh This was a relief lecture I now finally understand about ultraviolet catastrophe.Thank you Physics Girl

You are always interesting and informing. Thank you.

Love the energy and jokes :-)

BEST PHYSICS CHANNEL OF KZfaq!

OMG OMG OMG I LOVED YOUR CHANNEL THE MOMENT I SAW A VIDEO! AWESOME WORK!

Amazing explanation. Thanks

For those who understand French and want to know more about the UV Catastrophe and Quantum mechanics, I recommend a channel named "e-penser"

Man, I could watch her speak all day long

Very good explanation! Thanks!

The way you explains is very good keep going .....

One could say that your hair is a... _Violet Catastrophe_. (it actually looks nice I just had to make that joke)

The gorgeous natural blonde hair is partially gone more importantly.

great video~ the only one i could find which made ANY sense to me on the subject!

the position of electron that it can be anywhere until and unless we observe is called as super position you explain really good

If you measure the electron and find where it is, then how do you know that it could have been anywhere, when you've measured its exact location? In other words how do you know there's a probability cloud anyway?

violett... hehe^^ violett hairs... hehe^^ katastrophe...

The purple hair is an AWESOME touch!!

Well done video. Very fun to watch.

Why half of the messages are about her hair?

_"Everything we call real is made of things that cannot be regarded as real."_ *-- Niels Bohr*

very good! probably one of the best videos on the subject!

love your work

So if you teach science class as a series of facts to be memorized, you're doing it wrong. Teach the method of science, and your students will always be self correcting.

Learn something watching a fun, interesting video by an intelligent female. Then read comments, >50% about how she looks. Sigh.

Love the colour you dyed your hair with. I love violet and indigo. Also: This is was a very well done and interesting video! New stuff learned once again!

thank you for explaining

everybody in the comment section talking about the hair color.. guys she just talked about the foundation of quantum mechanics like seriously the hair color is more important than that? I am not saying that it is bad but you can just appreciate it without bringing it up and focus on the active topic..

Fifty five hundred = 55100 :D Just a joke. I always say five thousands and five hundreds...

Superb presentation of an amazing topic. Understanding has been expanded. Contextual realization(s) of the quantum idea(s) that are currently favored are beginning to shed light {pun intended} on the true nature of nature. Bravo! More like this one, please.

My fav channel for a reason!

Why can't you people see that particles are just artifacts in the Quantum Fields :P I'm just sitting here and going -.- People are still sticking to an old interpretation of the particle: a building block of the universe. Even the probability-cloud view is a bit old, I think; it just seems too mystical. It doesn't explain the transition between the electron when measured and the cloud when not measured. The Quantum Field view does a sort of better job at this: the particle is not so different from the cloud, the cloud is just the collapse of dense waves in one of the Quantum Field. But this is all from the top of my head. So, thoughts?

see now this, is a beautiful woman.

I love your enthusiasm!

This is a really good video, Thanks!