Nuclear Physics: Crash Course Physics #45

[@crashcourse]

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

[@tatiwhite6150]

Never paused and rewinded so much in my life

[@osavka14]

Totty W put in 0.75 speed it helps a lot

[@BlueKnightDragon]

I can relate here

[@nishtakasundass6669]

For the sake of physics, lol

[@shumaatiqunnassa4123]

osavka14 dude I did that wow

[@chadwildclay]

If this is only the intro, I'm in trouble.

[@saud9333]

Why are you watching these videos.... lol

[@saud9333]

Hahaah lol

[@randomalpaca]

Noorquaker I heard a kid recently watched the quantum physics video and didn't get messed up #real

[@randomalpaca]

7:34 sound quantum mechanics is the intro

[@randomalpaca]

I meant sounds like quantum mechanics is the intro

[@ndc5544p]

I just love how passionate Shini is about physics, thats why I like watching her videos. I'm sad that the series stops soon!

[@superplop1771]

i am just irritated that she speaks so bloody fast

[@aftereffectstutorials7513]

pengest munch slow it down

[@brycecarman7173]

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

[@unliyou]

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.

[@aaronesau9427]

Alpha Decay - 5:57 Beat Decay - 7:11 Gamma Decay - 8:41

[@hening2212]

bless you

[@JamesAw]

6:30 Transmutation You guys are sick bastards I love it Thumbs up for whoever put in that part

[@JamesAw]

AGAIN AT 8:13

[@basiec.9705]

James Aw Thank you for pointing that out!

[@ccib00]

Now that just savage. Just notice 8:13 one.

[@desertification]

Ni...na..

[@xgozulx]

omg i didnt get it at first but thats nina o.0 they have indeed a very black humour

[@raghdaelraaie9335]

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 !!

[@pranavprasad7264]

Can crash course do math? That would be a godsend.

[@salunkhesaurabh201]

yea I suggest too... From maths to pure maths... Oh yea !!!

[@crashcourse]

We're working on it. Believe it or not, Maths are quite the challenge :) - Nick J.

[@BarisPalabiyik]

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.

[@nikolasdoubouridis9244]

CrashCourse that's something I was wondering about, when ccmath is estimated to be released?

[@Nicrosyl]

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.

[@TsubakiIno]

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.

[@CloneoftelamonROBLOX]

The feels.

[@jaideepsingh4395]

Weebs everywhere... jeez

[@knightworld3019]

I really want to kill the guy who turned his daughter and dog into a chimera. I believe that John Wick will agree too

[@superplop1771]

holy jesus christ

[@RanitBhowmick]

ed... edward ??

[@chiragadwani1875]

4:20 I just love the way they animated Uranium. Lol it's cracking me up so much.😂😂

[@gretawilliams8799]

Chirag adwani You fool

[@lou626]

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

[@Ben786]

8:14 I laughed and then I cried

[@manalrani7683]

Why?

[@frustbox]

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.

[@vonneely1977]

frustbox: Cylons look like us, now.

[@vonneely1977]

Hero of Olympus: The Shatner Comma?

[@slightlynihilistickid1251]

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.

[@frustbox]

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. ;)

[@loveranime160]

xD u should check hawn's physiology . i had to stop and take it in . xD

[@ajasiouxbea4726]

I can't stop looking at how perfect your brows are

[@melontusk7358]

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."

[@jellechristiaans6838]

Amazing video, great to see everything I learnt in class explained in a slightly other manner within a mere ten minutes!

[@LinhPham-bx9fd]

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😃😃😃😃

[@marcus2118c]

Do more nuclear physics episodes, they're great!

[@sophieplace]

all i heard was "we like fma." and "to much pressure and it go boom boom!"

[@izack0ldtn902]

now explain me how does an RBMK reactor explodes?

[@matthewwoodfield475]

I saw that cheeky Fullmetal Alchemist reference

[@deathasphate]

The first rule of FMA is you don't talk about Nina, the second rule of FMA is YOU DONT TALK ABOUT NINA

[@KingsleyIII]

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.

[@lordshinkun]

What's up with the Fullmetal Alchemist references?

[@jelkehuisman]

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.

[@karisbarnett8338]

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.

[@brandoncox3227]

Also the equation E=MC2 and Einsteins paper on the general theory of relativity states that mass is a form of energy.

[@StephenGillie]

"Beetah" - Your posh way of saying words warps my Yankee mind :p

[@JustLost1030]

Hank and Jon, you guys are trolltastic and i love it. please never stop trolling.

[@AbdullahKhan-jc7lr]

I love physics

[@Feralfonso]

Thank you very much for sharing your knowledge. I'm civil engineer and I remember we vaguely study this in our chimistry class

[@hole1stdrillpresschannel]

Albert Einstein was born in Ulm, Germany. Me too. Yeah!

[@shantanumhaske2218]

hole - 1st drill press channel. And we don’t care

[@PFAlt]

Ulm world order /r/UlmGoneWild

[@as2b7]

And that's how universe balance things. 😜

[@phenomenalphysics3548]

That's why ur a genius😂❤️

[@yvonnekavithe6247]

It's much better coming here with some little data, explains much much better

[@AnchorJG]

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.

[@zarinawillows2347]

To all the people telling her to breathe - 1. There is a 3 dot icon on the upper right corner of your screen, click it. 2.Then you'll find a Playback Speed option. 3. Choose your desired speed. 4. And know that this channel is called "Crash Course". Hope this helps =)

[@ZeroSkipps]

8:14 is that a Fullmetal Alchemist reference i see sitting on the table

[@HELLO-cn9gx]

Yos

[@thehopeofeden597]

The Nina picture. You guys are trying to kill my feel.

[@hugfiyvhj]

THANKS

[@patcrane7938]

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.

[@BeCurieUs]

I said the same thing, but she specifically said "for carbon"

[@patcrane7938]

Christopher Willis Ah yes you are right. My mistake

[@patricksnyder3582]

Started going over my head about a minute and a half in. I’ll have to watch this many more times lol

[@DontMockMySmock]

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."

[@Rain.Mippet]

Thank you for your comment I appreciate the information

[@ryanantoniotti5473]

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 :)

[@echoes9966]

I would love to have CRASH COURSE ARCHAEOLOGY!!

[@Melonorm]

Awesome host and content! Thank you so much!

[@marcs9451]

THAT FMA REFERENCE RIGHT THERE

[@thecoolgamer8560]

Thank you

[@krishnakamble9698]

My God! You’ve explained it very brilliantly. Just that you should have also mentioned what charge each ray carry.

[@sambhrantagupta3522]

That was a great clearance of the concepts I was confusing in my nuclear physics chapter

[@Nerdthagoras]

First thing I noticed. Rubik's cube... with paint... in color other than standard colors.... :D

[@tanvish2689]

Covered basics of nuclear physics very nicely in limited time.Excellent very useful !!!

[@morgangraley1049]

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.

[@maleeshapriyanjana7604]

wonderful. i understood this deep theory within this 10 minutes of small time.Thank you!

[@coursechawer5296]

plz help The systolic pressure in a major artery is measured at 115 mmHg. What is the net force on a 1 cm2 section of the arterial wall if the (absolute) pressure in the tissue outside the arterial wall is 109 kPa? (Patm = 101.3 kPa) Answer: 0.76 N

[@jasperbutcher2596]

Please do a part 2! :D I wanna study nuclear physics now because of this video.

[@BeCurieUs]

I keep nagging them to make a nuclear physics one :D

[@mr.microcuries2078]

A HappyOyster I would highly recommend it. Go buy a Geiger counter and some uranium glass for a start!

[@michellenorman1844]

Hahaha banana would be cheaper :D

[@ektasaikia7153]

Blue Dolphin 2017 and lighter😁

[@anandansu5405]

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.

[@Angela-pr4xh]

Thank you didi, I was able to understand so nicely because of this video 😭😭😭

[@josephstjames6642]

Great video

[@indukrishnar5244]

I hope you will bring an entire series of the nuclear physics...

[@Jacman8]

That unsolved 6x6 in the background is stressing me out

[@rednax3788]

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

[@SKSFootballWalla]

Very good Ravi sah ❤❤❤❤❤❤❤❤ 0:34 0:36

[@joshh6809]

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"!

[@jahinsultana3071]

U r an awesome teacher

[@prathamarya9825]

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)

[@danielweatherly9733]

I really liked it the first time I saw it. So much I watched it again!

[@mathstaylor8786]

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.

[@eduAC.]

Did a read... transmutation!? FEELMETAL ALCHEMIST ;_;

[@saadaansaadi8667]

ther e is aterm for them called alchemy or (alchemist)

[@markjackson6642]

Science is one of the very powerful knowledge! : )

[@mohamedelmi5028]

this was the best intro ever

[@rhemawords2542]

what brilliant teacher with amazing lecture Thanks!

[@btc54723]

Love that Nuka Cola Fallout reference

[@philrobichaud3063]

Great video! Love everything you Crash Course puts out!!

[@furn2313]

More videos like this would be awesome

[@lancemulkey1225]

Wow this helped with my homework

[@norbulhendup6354]

Last episode? Please Don't stop this series on Physics

[@bogopaintmasterbogopaintma5009]

E-energy M-mass C-cuet of light

[@benaaronmusic]

Great video, CrashCourse

[@utsuhoreiuji4526]

Nice video, thank you!

[@tcritt]

This topic was doing my head in for ages. I get it now, thanks so much!

[@hammadusmani7141]

That was such a great explanation!👍 Great graphics too

[@odhaliafirmalita9989]

Thank you!

[@TopHatProductions115]

This video is highly informative. I wish I had seen this in middle school...

[@fincorlett4609]

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.

[@Xilotl]

Whats the different between nuclear physics and chemistry?

[@hemalatasamavedula7345]

why a re upload ?anything different this time}?

[@Nilguiri]

I was going to say that they have corrected two of the atomic masses which Shini misread in the first one. But they're still wrong in this version! 3:06 & 3:30

[@arthurabraham3271]

Looks like CC took some interns. Lolz.

[@splat1012008]

I'm pretty sure this was a reload. That or I'm having the worst case of deja vu !

[@hemalatasamavedula7345]

Nilguiri yeah u r right.

[@crashcourse]

Yes. There were a couple graphics errors that we had to fix. :) - Nick J>

[@mattt2684]

You do a great job explaining things!

[@anenaude5343]

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.

[@edwardwilson8595]

6:30 this wasn't meant to be a reference to FMA with the dog, the girl and transmutation, was it?

[@cantstopmygo420]

Crash Course you should mention to Shini she would have a great career as a audiobook speaker. Great voice!

[@empiretotalwar3]

second best looking person to be on crash course

[@Spiderman-ot9ek]

This was more clear than my advance chemistry book. Thanks for this high quality video!

[@axelandersson6314]

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?

[@BeCurieUs]

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!

[@MichaelJE2]

What prevents macro-sized lumps of neutrons from forming anywhere except neutron stars?

[@timbarclay738]

Very interesting video

[@asmnazmuzzaman1703]

Good to learn about alpha beta and gamma emission

[@brandoncox3227]

Mass and Energy are not equal! Mass is a property of Matter. Energy adds to the mass of a given object or atom. You cannot convert mass into energy or energy into mass that is not how it works. Energy being released when a nucleus is broken down is a different thing than saying you are converting mass into energy. Technically speaking when neutrons and protons come together to form a nucleus a small portion of their mass is given off as light.

[@lindahuynh3314]

this video is going to save my chemistry grade

[@ashrujagansamantasinghar2558]

Pretty good

[@ashrujagansamantasinghar2558]

Yeah that's right, you are a bit faster. You could take a little more time to make us understand better. 😪

[@gavinjones]

beautiful video ! very informative and easy to understand

[@dhirajpanchal4676]

please make a video on "general relativity" also