Nuclear Reactions, Radioactivity, Fission and Fusion
ฝัง
- เผยแพร่เมื่อ 19 ม.ค. 2016
- Radioactivity. We've seen it in movies, it's responsible for the Ninja Turtles. It's responsible for Godzilla. But what is it? It's time to learn exactly what nuclear reactions are, and what it is that makes atomic bombs so destructive, not to mention what makes nuclear fusion reactors our best hope for clean energy in the future.
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I am a 66-year old retired accountant trying to fill the gaps in my knowledge of basic science. For my purpose, your videos are head and shoulders above everything else on TH-cam: Clear, Concise, and Complete. Many thanks. I won't say "Please keep up the good work" because I already know you will.
this science is hardly "basic." this is well above basic
@@AAG414 not that hard to understand though
@@AAG414 No its basic
@@firstlawgaming2680 You need a reference point for that statement. Grade 1 high school?
Wow motivation for me because im 19 and dont give attentiin towards my studies 😂🥺🥺
I'm a physics and chemistry teacher and I be watching your videos to help explain things to my students. Thank you!
I hope your not teaching your students to speak like that. You contribute to the dumbing down of humanity.
Can you help me?
@@footrot17 maybe check your own spelling before hitting "send" on those judgmental comments of yours! 🙄 *YOU'RE* hilarious
@@MrsNoble2007 nigga, dont let me yo ass
@@wh00lio 🐫💩
This was a good video. I can't express how satisfied I am by it. You covered everything my Professor took two weeks to explain in 14 minutes.
Nope
He covered everything our professors couldn't explain in a whole semester.
@@paulina4925 thats true
Your professor covers anything? You’re lucky.
Literally
I'm sure you get comments like this all the time, but damn dude, you're awesome! This 14 min video offered a way better explanation than an entire semester of radioactivity courses and seminars. Thank you.
I never knew someone could be this good at teaching, explaining creating content👍
*You really set the standards high*
He's dogshit at explaining and creating content. He's reading stuff he doesn't understand and doesn't go shit into detail. He's one of the worst teachers ever and this video is very boring.
@@OkKhaos Mind to tell me why?
@@TheFirstNamelessOne I did. Read again!
@@OkKhaos You're right! But please do not expect anything big from a minute video. Read books, magazines in order to understand this video is mostly a recap.
OkKhaos he isn’t going into details because he is explaining the base. And what are you saying he knows nothing about science he is a science communicator of course he must know his stuff
I had forgot everything I learned as soon as I passed out from highschool, despite having aced in the exams. By the time I finished engineering, highschool chemistry was like an unknown language to me.A couple of minutes on your videos and everything just came back to place.
I still refer your videos instead of old textbooks. Thanx a lot.
yeah agreed.
you misspelled thanks idiot
@@donniefan5345 its short form.
Made me love chemistry even more. Keep rockin Doc
Umm Doc ? He isn't a Doctor .
Now I am ready for an Openheimer
haha same
Great video. This explains exactly what our NGSS STEM Chem students need for a review of concepts in nuclear changes. Thank you!
You explain things so much simpler than my professors. I’m so thankful I found your channel!
I’m a computer science student but I just find this really interesting. Way cooler than sitting in front of a screen programming all day
I am happy I understand decay mechanics better now. It aided me to understand geological dating processes in a more complete manner. Thank you so much!
Thank you professor Dave! These videos are perfectly concise, I didn't get the concept fully when my teacher taught this, but now it's all clear
You made it so simple, thank you for that.
I subscribed. You explained it so well, combined the Phisics and the Chemistry sides in one video. It's so clear to me now. Thank you.
The clarity of Dave’s explanation is stunning. 🙏🏻👍
I like how you relate the topic to visuals and real examples so I can remember it easier.
I've learned a lot through this video this must be helpful for my studies. Thank you
I watched all the playlist! Your videos rock, they explain everything in a couple of minutes! Congratulations and thank you so much! Keep doing them! Greetings from Uruguay, South America :)
it's my great pleasure! tell your classmates!
I wish I valued your channel more back in high school. Your videos really help to give me a better understanding of science.
Love your videos ... Please keep making them!
Excellent video! Really helped thanks
I like how you relate the topic to visuals and real examples so I can remember it easier. THANK YOU!!
You're videos help me a lot while trying to learn new things where I don't have to worry about learning basics 'cuz your videos are so deductive and are like keys to my preparations. Thank you so much Dave sir.
Watched many videos on related to this and this has been my fav so far. Big and small pov really helped! Thanks professor Dave Explains.
Hi Doc, you always explain things with such clarity that it STICKS to one's mind!
OMG ur explanations literally answered all of my questions ❤️❤️❤️
Helped a lot with starting the topic of radioactivity and the test coming up thanks :)
0:58
Flat earthers: *hey dont forget about us we use it to explain literally everything*
amazing job .. thanks professor
This was a video I was looking for and you explained it very well. Thanks
This was right to the point explanations. Thank you Prof. Dave.
Thanks for your excellent video,though I had studied in collage four decades ago but still keep in touch with matters connected with nuclear science,your lecture was like a refresher course and beautifully presented.Thanks again.
Best video that I have seen regarding this topic. Thumbs up!
Love your video, it's very comprehensible to newbies like me! :D Thanks!
No words to explain you ......why u haven't a nobel in teaching.....such a great personality
You are an idiot. He's un-engaging, boring, and can't teach. He can't remember anything, can't you see him reading off of something behind the camera. There isn't any eye contact and you can see his eyes move back and forth as he reads. He's a terrible teacher, and this is one of the worst videos I have ever seen. He doesn't even have a personality. His voice monotone the entire time and he's not even good at public speaking.
You helped me pass a ap Chem test thanks
Happy to be thought by a great professor like you , your scessions are very short and admiring , i post this message with a great sence of gratitude .Thank you sir for your great works which helped me a lot, for better understanding.
these videos helped me with my Final sooooo much. omg i wish there were more
I simply love your videos! Gosh you are amazing!thanks a lot professor! :)
Well explained! Thank you so much we love you.
Why have I never encountered a teacher that would give a quick summary like this before getting into the details ? It's so much more interesting to know the point of a lecture before getting deep into the details. In school it's just present the details as dull as you can. Memorization is the focus rather than understanding
One of the best explanations about physics I ever seen, good going sir.
Thank you Sir..
Beautifully explained with all details.......wow
Dave, this was such an excellent video. Thank you SO much!
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I have been watching documentary about quantum and particle physics and didn't really understand everything cuz everything was explained at higher level...but this video broke everything down for me and now I understand why nuclear reaction happens and it make real sense...thanks for this video...tho old, it still gold for understanding basic knowledge
He knows about all the science stuff! With Professor Dave Explains... THANK YOU SO MUCH!! 💕💕
This is a very special video. Clear, thorough and concise...and bookmarked
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This was explained so well! I loved it!
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Simple and helpful,thanks
Thank you professor Dave. It is so informative
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Great lecture well organized!
The world needs professors like you.👍
Very nice video. Thanks man!
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Professor Dave you are seriously the best. You are the reason I am passing chem 2
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Unbelievably informative and succinct video
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Hello professor! Thank you very much for the videos!!
At 8:35 the positron emission is said to come from a proton becoming a neutron and expelling this positron (of negligible mass).
I can't just think how can something become something of greater mass (even just a little greater) and on top of that expel another particle.
Most likely more particles are involved so when I check the physics Playlist I will find out!
Thanks again!!
Mass of the nucleus is different than the sum of the protons and neutrons which make it.It enables total mass of the nucleus to decrease after beta plus emission.
you legit taught me everything for my chem final thanks dude :D
You're the best man.
I wish you taught a nuclear engineering course
You're awesome man. Love you video
it would have been nice to verbalize all the written examples of reactions; oven so, one of the best explanation I've seen; instantly subscribed
he really explains well. thanks to you
Excellent information. Thank you
Thanks for the information.
Wow thanks for making this quality educational video. You deserve a 🏅
very helpful!!! thank you
I understand about positron......but what about *Megatron* ...?
Hi im Rodemer from Philippines i watched this video your video expalin everything that makes me have an idea that have to do my assignment so thank you to this video Keeping doing Sir i salute you
Humanity’s rejection of Nuclear power was a massive mistake, and the environment has payed dearly for it as we continue to rely on fossil fuels for our electricity
I wouldn't accuse all of humanity, rather it is minority groups made up of paranoid teenagers and ecowarriors who oppose all sorts of things, nuclear, GMOs, fluoride, 5G, amalgam fillings, E-numbers, "chemicals" and microwave antennae, and who are convinced the oceans are rising up to drown us all shortly (they are rising, but our fingernails grow faster). If electricity and gas were to be invented today, they would surely oppose them too as "invisible killers".
Love your video, and your way of explaining things (special mention for A and Z, number of mass/charge, crystal clear).
Plus, cross-references to chemistry, and deeper, to biology, immediately give a good impression.
I just found one mistake that could be harmful:
8:12 - neutron "is heavier by *exactly* the mass of the electron" is completely false: if we count in MeV/c², which is the standard in particle physics (people even omit the "/c²" and just say: ) neutron is (roughly) 939.6 MeV. On the other hand, proton is 938.3 MeV, and electron is just 0.511 MeV. Then adding proton mass and electron mass together is still 0.8 MeV away from neutron mass. It's even worse when we consider proton decay (that does *not* exist outside of a nucleus), where proton is still 938.3 MeV and neutron+positron is 940.111 MeV: there is 1.8 MeV appearing from we-don't-know-where (actually we do: it's coming from the other particles of the nucleus wherein lays the "decaying" proton).
Speaking short, beta-decays and mass studies both are absurdly fascinating subjects, awfully more complex than just a sum of mass and an equation.
It's been 4 years already, and this message could be totally pointless. But, well, to anyone who wants it :)
Thanks
I've learned that I like necular physics and learning about radiation. Thank you for this video.
10:19 Hotel? Trivago
A very nice helpful and educational video
this is so cool. thank you prof
beautiful explain thanks
great teaching skills sir!!!
Thank you SO much
Great explanation
I feel this could benefit from explaining the gamma radiation that occurs that from the positron electron annihilation in B+ decay. Otherwise a good lecture.
Great and accessible video! One small caveat to keep in mind: the mass of a neutron is not exactly the mass of a proton + the mass of an electron . The masses of a neutron/proton/electron are 939.566 MeV/c2, 938.272 MeV/c2, and 0.511 MeV/c2 respectively, which leaves 0.783 MeV for kinetic energy. In case anyone caught it, the process of positive beta emission actually generates mass, which is why it can only happen inside a nucleus under certain conditions, whereas regular beta decay can and does happen with free neutrons. Conservation of mass isn't a fundamental law of physics.
I loved the test at the end actually.
Positron and Electron: Weigh the Same - opposite forces
Neutron weighs more than Proton
Neutron loses electron -> Becomes proton (lighter)
Proton loses positron -> Becomes neutron (heavier)
How does a proton lose something but become heavier?
+Donovan Patar something about the properties of the positron! very strange stuff, you know.
Donovan Patar
Neutron emits antineutrino and loses electron becomes lighter proton..
Proton emits neutrino and positron. stay the same but to a lesser extent lose some weight as it was before because positron is too small as compare to electron but just loses positive sign.
@@ProfessorDaveExplains I think it is because losing positron is the same as gaining electron, just my theory
harisgaming it’s because of what’s happening inside the nucleons. A proton consist of two up quarks and a down quark. Up quarks have 2/3 charge and down quarks have -1/3 charge. Adding them together and you see where the proton gets it’s positive charge from. Up quarks have less mass than down quarks. A neutron is composed of one up quark and two down quarks. So adding the charges you get 0. When a proton decays into an neutron it releases a W+ boson which decays into a positron neutrino pair. What is happening inside the proton is that one of its quarks is sending out 1 positron worth of charge which changes it into a down quark (2/3-1=-1/3). Since down quarks have more mass the nucleon has gained mass. It’s something to note that the gained mass comes from the quarks interaction with the Higgs field since down quarks more strongly interact with it. It didn’t just come from nothing. At least that’s my understanding of it.
@@WilliamCacilhas I've logged in just to write you a big thank you man. I was looking for a proper answer for that question in comments, but most of it is just "buttlicking" . Thanks for making it clear, or at least as clear as you understand it.
Best explanation !
I understood everything. Thank You Very Very Much Professor Dave !!
In that case, would you mind explaining why mass is lost during nuclear fusion and what mechanism converts it to energy? I feel like I didn't get understand that part.
Hey,Professor Dave. Thanks for your simplicit lectures and they help me alot.I have recommended this channel to many others. I have one question in my mind.
"What happens with the electrons of the atoms during any nuclear decay? Can positron emitted from nucleus collide with shell electron and get annihilated along with the electron releasing gamma rays?Will alpha particle take two electrons along with two protons? Can Beta particle(electron from nucleus) knock out shell electron during its emissions?
Plz answer this I'll be thankful.
I posted this question here because I know Professor Dave and his intellectual subscribers can only answer this.
Hi, yes a positron emitted from the nucleus will definitely at some point encounter an electron and undergo annihilation emitting two gamma rays in addition to ionising that atom. But with regards to your second question, an alpha particle does not take electrons with it when it exits the nucleus, but when it encounters another atom it can rip electrons from that atom causing a normal chemical ionisation of that atom.
@@ridinggambit5017 Thanks for the answer
But why alpha particles not take electrons from their parent atom while emitting from its nucleus?
@@medicaldoctor8983 I'm not sure, the academic papers just say that overall electric charge is conserved during alpha decay.
@@ridinggambit5017 It would be interesting to do a research on that
But thats not my field 😢😢
Good set of questions!
thanks dude !
Brilliantly explained 👏👏👏👏👏