Nuclear Physics: Crash Course Physics #45
ฝัง
- เผยแพร่เมื่อ 30 มิ.ย. 2024
- It's time for our second to final Physics episode. So, let's talk about Einstein and nuclear physics. What does E=MC2 actually mean? Why is it so useful to us as physicists and humans? In this episode of Crash Course Physics, Shini sits down to go over the basics of it all.
***
Crash Course is on Patreon! You can support us directly by signing up at / crashcourse
Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:
Mark, Les Aker, Robert Kunz, William McGraw, Jeffrey Thompson, Jason A Saslow, Rizwan Kassim, Eric Prestemon, Malcolm Callis, Steve Marshall, Advait Shinde, Rachel Bright, Kyle Anderson, Ian Dundore, Tim Curwick, Ken Penttinen, Caleb Weeks, Kathrin Janßen, Nathan Taylor, Yana Leonor, Andrei Krishkevich, Brian Thomas Gossett, Chris Peters, Kathy & Tim Philip, Mayumi Maeda, Eric Kitchen, SR Foxley, Justin Zingsheim, Andrea Bareis, Moritz Schmidt, Bader AlGhamdi, Jessica Wode, Daniel Baulig, Jirat
--
Want to find Crash Course elsewhere on the internet?
Facebook - / youtubecrashcourse
Twitter - / thecrashcourse
Tumblr - / thecrashcourse
Support Crash Course on Patreon: / crashcourse
CC Kids: / crashcoursekids
![[Full Episode] MasterChef Junior Thailand มาสเตอร์เชฟ จูเนียร์ ประเทศไทย Season 3 Episode 4](http://i.ytimg.com/vi/e7Oqqo90x_w/mqdefault.jpg)
We made quiz questions to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: apple.co/3d4eyZo
Download it here for Android Devices: bit.ly/3TW06aP
Never paused and rewinded so much in my life
Totty W put in 0.75 speed it helps a lot
I can relate here
For the sake of physics, lol
osavka14 dude I did that wow
If this is only the intro, I'm in trouble.
Why are you watching these videos.... lol
Hahaah lol
Noorquaker I heard a kid recently watched the quantum physics video and didn't get messed up #real
7:34 sound quantum mechanics is the intro
I meant sounds like quantum mechanics is the intro
The only thing I learned from this video is that I can space out for 10:24 with no recollection of what I just watched
I just love how passionate Shini is about physics, thats why I like watching her videos. I'm sad that the series stops soon!
i am just irritated that she speaks so bloody fast
pengest munch slow it down
Please continue to make more videos on nuclear physics topics and do it in a crash course manner. It is the perfect way of doing online learning and the way you do it, nothing like it on the internet. Excellent work to your team.
6:30
Transmutation
You guys are sick bastards
I love it
Thumbs up for whoever put in that part
AGAIN AT 8:13
James Aw Thank you for pointing that out!
Now that just savage. Just notice 8:13 one.
Ni...na..
omg i didnt get it at first but thats nina o.0 they have indeed a very black humour
Alpha Decay - 5:57
Beat Decay - 7:11
Gamma Decay - 8:41
bless you
these videos were so much fun to learn from during high school and it's amusing to watch them all over again now ~ love this !!
8:14 I laughed and then I cried
Why?
Amazing video, great to see everything I learnt in class explained in a slightly other manner within a mere ten minutes!
umm at 6:30 is it a FullMetal Alchemist Reference? or is it just me? The little picture I mean.
EDIT: 8:14 OMFG. HOLY S***.... ITS REALLY IS.
The feels.
Weebs everywhere... jeez
I really want to kill the guy who turned his daughter and dog into a chimera. I believe that John Wick will agree too
holy jesus christ
ed... edward ??
Can crash course do math? That would be a godsend.
yea I suggest too... From maths to pure maths... Oh yea !!!
We're working on it. Believe it or not, Maths are quite the challenge :)
- Nick J.
Apart from teaching math on its own. Telling how integration, differential equations, series can or will be used in our daily lives would be great. I'm ee engineering senior and i had to research them myself, just teaching theorems, pushes people away from the calculus or dif.
CrashCourse that's something I was wondering about, when ccmath is estimated to be released?
Pranav B PBS has one on math called Infinite Series, however, it takes on more of a Numberphile approach to mathematical topics.
Also check out 3Blue1Brown and Mathologer.
Does she ever breathe?
I like the content and of course I realize that this is edited together from multiple takes, but please, dear editor of +CrashCourse, please include some breaks and pauses every once in a while and give the viewers time to process the information.
frustbox: Cylons look like us, now.
Hero of Olympus: The Shatner Comma?
i agree but at the same time the quick information kind of forces you to take notes or watch a clip multiple times which usually makes you understand the subject better.
Hero of Olympus The pause button would still have a use. But human speech has a natural rhythm to it, we make pauses or speed up or slow down certain passages to get a point across. That seems completely missing here, making everything feel very rushed.
Yes, it's a crash course, so of course the material will be densely packed and require multiple viewings to fully comprehend, maybe even the use of the pause button - while retaining a slightly slower speech tempo. My point is that there's a big difference between processing the information contained in a sentence (I'm OK with that being challenging) and being able to follow the words that make up the sentence.
I guess what happens with many of these crash courses is, that they do multiple takes, and if you repeat a given sentence over and over, you naturally speed up and say it faster, then in the edit things get cut even tighter, cutting away small moments of silence. The effect feels really rushed, and all that would be needed would maybe add up to 30 seconds longer videos.
it's not like PBS doesn't know how to do that - look at PBS SpaceTime or PBS Infinite Series for comparison. The hosts talk a little slower, the takes are longer, but it is still packed with information - and the videos have roughly the same length. So, it's possible. ;)
xD u should check hawn's physiology . i had to stop and take it in . xD
i love how you mentioned half lives and gordon was there! I been a fan of half life for so long , it was wat inspired me to study nuclear psychics
Great video! Love everything you Crash Course puts out!!
Feel so sophisticated with my choice of Physics major up until now!!! This video is amazing. Thank u so much my life saver Crash course😃😃😃😃
Quite interesting, reading ocassionally about nuclear physics didn't really get me to self-study it, but upon hearing what the complex sounding words are, the subject became a lot more clear. This video felt like packing something apparently complex into a 2nd grade lesson, very easy.
That was such a great explanation!👍 Great graphics too
Awesome host and content! Thank you so much!
Do more nuclear physics episodes, they're great!
Thank you very much for sharing your knowledge. I'm civil engineer and I remember we vaguely study this in our chimistry class
Lol, at 0:50, it says "In 2020, CERN opens a cosmic portal and unleashes C'thulu, who runs for office and wins", also "neutrinos have mass and it's a massive deal."
now explain me how does an RBMK reactor explodes?
What's up with the Fullmetal Alchemist references?
I know this is a late sesponse, but nuclear physics and radioactivity can change the stucture of a substance at the atomic level, converting it into something different. This is exactly what historical alchamists tried to do.
Also the equation E=MC2 and Einsteins paper on the general theory of relativity states that mass is a form of energy.
Covered basics of nuclear physics very nicely in limited time.Excellent very useful !!!
You do a great job explaining things!
4:20 I just love the way they animated Uranium. Lol it's cracking me up so much.😂😂
Chirag adwani
You fool
I can't stop looking at how perfect your brows are
Hank and Jon, you guys are trolltastic and i love it. please never stop trolling.
beautiful video ! very informative and easy to understand
This topic was doing my head in for ages. I get it now, thanks so much!
That was a great clearance of the concepts I was confusing in my nuclear physics chapter
Just awesome! Keep up the great work!
My God! You’ve explained it very brilliantly. Just that you should have also mentioned what charge each ray carry.
wonderful. i understood this deep theory within this 10 minutes of small time.Thank you!
The first rule of FMA is you don't talk about Nina, the second rule of FMA is YOU DONT TALK ABOUT NINA
Even though Shou Tucker doesn't have too much relevance after the beginnings of either series, he's one of my favorite bad guys because of how twisted and evil what he did was.
Started going over my head about a minute and a half in. I’ll have to watch this many more times lol
I really liked it the first time I saw it. So much I watched it again!
Please do more videos that are relative to engineering students. its hard to find videos such as these that properly explain our work in an interesting way.
all i heard was "we like fma." and "to much pressure and it go boom boom!"
Nice video, thank you!
To any of the on set crew/anyone with authority: Invest in some sound dampening blankets or something to put behind the camera where the talent is facing. That way their voice won't bounce around the room. Hanging blankets on a green screen/light stand would help the audio echo a ton.
Love the videos :)
what brilliant teacher with amazing lecture Thanks!
Every science class i ever had from elementary school to high school, we NEVER made it to atomic science. I didn't learn about isotopes until Chem 101. So my past-self is thankful for this series.
4:07 has a typo; oxygen has a Z = 8, not 18 (that would be argon). It doesn't make sense to have an A < Z, since each proton contributes 1 u each, plus the added mass from the neutrons as well. I'm not too familiar with the binding energy graph, but I imagine O-16 is what was intended here.
I hope that next time you would explain about liquid drop model, shell model & semf 😭 btw your explanation is good. Thanks a lot
loved this episode ♡
8:14
is that a Fullmetal Alchemist reference i see sitting on the table
Yos
More videos like this would be awesome
This video is highly informative. I wish I had seen this in middle school...
I saw that cheeky Fullmetal Alchemist reference
For all wondering:
They fixed the graphic at 8:38 (it's also used a couple other times)
Previously, it used to say "alpha" for all types of decay.
Edit: They probs had other fixes too
"Beetah" - Your posh way of saying words warps my Yankee mind :p
Great video, CrashCourse
I would love to have CRASH COURSE ARCHAEOLOGY!!
Thank you!
Great video
Science is one of the very powerful knowledge! : )
Thank you didi, I was able to understand so nicely because of this video 😭😭😭
thx for this awesomely ha bisky vid i love learning and this was a great video i really enjoyed this
I hope you will bring an entire series of the nuclear physics...
Please do a part 2! :D I wanna study nuclear physics now because of this video.
I keep nagging them to make a nuclear physics one :D
A HappyOyster I would highly recommend it. Go buy a Geiger counter and some uranium glass for a start!
Hahaha banana would be cheaper :D
Blue Dolphin 2017 and lighter😁
I love this channel
It's much better coming here with some little data, explains much much better
Very interesting video
U r an awesome teacher
I really hate the way that so many physics teachers talk about mass-energy equivalence in the context of nuclear physics.
You'd never hear a chemist say that burning coal releases energy because some of the mass of the coal is converted to kinetic energy. Instead the chemist would say that chemical potential energy was released when the carbon combined with oxygen to form carbon dioxide. Yet the former explanation is technically true - the coal plus oxygen before the burning weighs a teeny tiny bit more than the carbon dioxide afterwards. But that former explanation doesn't actually tell you anything interesting. What's interesting is that CO2 is bound more strongly than a combination of pure carbon and pure oxygen, and that forming those bonds therefore releases energy. It'd be more sensible to say that the energy of the molecules changed, or equivalently, the mass of the molecules changed (although in the case of chemical reactions, that mass difference is so small as to be unnoticeable), and the REASON for that change is the difference in chemical binding energies. The fact that mass and energy are equivalent ends up being pretty irrelevant - might as well just talk about the difference in energy.
The same applies to, say, alpha decay. If you measure the masses, you notice a difference, but that's not the CAUSE of the energy release - that's the EFFECT of the energy release. That is, in fact, equivalent to saying "there was energy released." Because mass and energy are the same thing. The CAUSE of the energy/mass release is the difference in nuclear binding energies, akin to the difference in chemical binding energies in the previous example. What's remarkable is that this energy release is so LARGE that we CAN measure it via measuring masses (whereas in chemical reactions the energy differences are negligible compared to the actual masses involved).
Besides, technically the "masses" (in the sense of relativistic mass, in the sense of the "mass" that Einstein was thinking of when he wrote E=mc^2) of the products are exactly equal to the reactants, IF we include their kinetic energy. Only once we slow that alpha particle down below relativistic speeds, thus robbing energy (and mass) from the system, do we notice that it weighs less than before.
Basically, what "E=mc^2" told us is not that "energy can be converted into mass and vice versa," it told us that the thing we used to call mass is actually the energy of an object, and therefore it changes when we add or subtract energy to that object.
This all gets a little muddy once you take into account the fact that physicists usually use the word "mass" to describe a second, related concept: "rest mass."
Thank you for your comment I appreciate the information
Thank you
Albert Einstein was born in Ulm, Germany. Me too. Yeah!
hole - 1st drill press channel. And we don’t care
Ulm world order /r/UlmGoneWild
And that's how universe balance things. 😜
That's why ur a genius😂❤️
when describing alpha decay, you said that the parent nucleus weighed more than the sum of the daughter nucleus and the alpha particle. Surely they are more massive than the parent nucleus because less mass is being used in binding energy.
cool + cool + cool ! Really! An amazing video !
Wow this helped with my homework
this was the best intro ever
THANKS
THAT FMA REFERENCE RIGHT THERE
That unsolved 6x6 in the background is stressing me out
I’m self teaching myself math and science mathi I am way into math now but I am it sure what topic in physics I like the most I’m am almost at so calls math level, and I have noticed I’d need chemistry. I can not seem to make my mind up weather to stick to khan academy or go to pdfs or what to do for the best, because I whant to do my best, way I’m doing it, I realised I love the math and science slow I am 38 now. And come so far on it.
love this ❤️😍
Thankyou teacher. The mass of helium nucleus is less than individual masses, then how we come to know that the nuclei contains 2 proton and 2 neutron.
Love that Nuka Cola Fallout reference
I am so inspired by Dr. Somara. As a woman of color in the chemistry field, she motivates me to be proud and confident about my science.
Last episode?
Please Don't stop this series on Physics
When an alpha particle is emitted, what happens to the electrons? Do they get sent away? Does the parent particle become ionic? Do they just become energy? Are positrons emitted to cancel out the charge?
Yes, they are completely ionized. They will eventually find some electron buddies in the world, but that, along with their speed, is what allows them to do damage to DNA. The electrons that remain on the parent atom will be use to reduce the oxidative status of surrounding chemical elements. Now, often times that parent has so much energy as well that those electrons will have enough energy to ionize as well, in fact, sometimes even multiple ionizations will take place...but these processes are chemistry and not "nuclear" in the strictest sense. Now, if you just had all this in a box, what would likely happen is the helium gas would just steal the electrons from the decaying atom...but charge is conserved!
please make a video on "general relativity" also
That FMA reference hurt my soul
Crash Course you should mention to Shini she would have a great career as a audiobook speaker. Great voice!
This was more clear than my advance chemistry book. Thanks for this high quality video!
Did a read... transmutation!? FEELMETAL ALCHEMIST ;_;
ther e is aterm for them called alchemy or (alchemist)
The Nina picture. You guys are trying to kill my feel.
can you do an episode on "strong force"?
The most stable configuration is not when the number of protons equal the number of neutrons. This may seem to be the case for low Z materials, but it diverges as the atomic number increases. For example Uranium 238 is the most common isotope of uranium which is 92 protons and 146 neutrons.
I said the same thing, but she specifically said "for carbon"
Christopher Willis
Ah yes you are right. My mistake
loved this one! Also, is it just me or does she look a bit like Phoebe Tonkin? There's something about her facial features or perhaps the way she talks that makes the two look very much alike:)
actually it is the residual strong force that holds neutrons and protons not the strong force (it is responsible to hold the quarks in protons and neutrons)
What prevents macro-sized lumps of neutrons from forming anywhere except neutron stars?
Well, plutonium does have.... ok i don’t know. Please do a video on plutonium! It’s my favorite element on the periodic table on the reactive stage.
Loved the Fallout reference.
my inevitable reaction to the 1.00043 (-23)* is atomic meltdown... I am now the egg in the pan (this is your brain on drugs commercial) with this video! the title of this video should be " this is your brain on learning"!
Very good Ravi sah ❤❤❤❤❤❤❤❤ 0:34 0:36