Alpha particle decay

Рет қаралды 42,235

DrPhysicsA

Күн бұрын

The cause and mechanism of alpha decay.

Пікірлер: 56

@racrazavenshev1571 8 жыл бұрын

The host does a very thorough effort of explaining these concepts, and very intelligibly. More so than some college courses.

@shabbirahmed1204 3 жыл бұрын

You are an excellent teacher sir. Thank you for these brilliant videos

@Therock151214 Жыл бұрын

One of the best

@josedelgado6972 4 жыл бұрын

Dr. Physics A, Thank you for your great videos! I love your content

@lahockeyboy 6 жыл бұрын

Thanx for your generous videos, Doc!

@AK-nd9io 6 жыл бұрын

Very informative and exactly what I was looking for alpha decay

@fatihokhider 10 жыл бұрын

this is the most clear explanation of the way alpha particle or indeed any thing coming out of the nucleus, classically and "quantumly"referenced with simple math in between. This way I discover is excellent and allows one to answer his own questions, which are necessary for understanding any non-simple system like radioactivity. I hereby congratulate DrPhysicsA for their excellent exposition.

@headstruckgamer857 5 жыл бұрын

Your very good at ur job. Im 15 and you helped me understand for a gcse.

@richardscott248 8 жыл бұрын

Thank you.

@wbcs3605 7 жыл бұрын

sir your videos are so nice and easy to understand .....I'm a physics honours student .....my final year exam will held on next year march ....please make some videos on atomic physics and special theory of relativity ......thank you sir ...

@rajatpuri3186 9 жыл бұрын

great video

@willdeary630 10 жыл бұрын

Great recap on this topic

@dksharma37 6 жыл бұрын

This video is very helpful...

@grobinfgregorius1052 8 жыл бұрын

Very Nice Video, thanks. The only question i have is where the alpha particle gets the energy to tunnel in the first place. Is it because when the alpha particle forms in the nucleus some of the mass of the protons and neutrons is converted into energy (so the mass defect)? Thx for your help anyways. Going to see some of your other videos too. :D

@richardscott248 8 жыл бұрын

I'm thoroughly confused on one specific matter. At 7:34 and 9:39, you use the same written symbol for two different functions, under different names. The first, you seem to pronounce 'e' (like the first e in electron), and the second, it seems like you refer to it as "log." Would you mind clarifying this, please?

@DrPhysicsA 8 жыл бұрын

+Richard Scott I am using Naperian logs - which are logarithms to the base e (=2.71828).

@YourAverageHater 10 жыл бұрын

What happens to the atoms electrons as the nucleus is losing more and more alpha particles, until its stable?

@Sauron191 5 жыл бұрын

Right! Trying to understand the ‘danger’ of alpha and beta radiation .. I think I wrongly presumed that the energy released during alpha decay was gamma rays .. Now I think I understand that the alpha particle has kenetic energy, travelling at high speed that can damage our cells (in laymen’s terms) is that correct? ... Would that be the same with the electron in beta decay? .. I get the gamma ray radiation dangers

@calihawa 7 жыл бұрын

It little confusing regarding coulomb potential at the edge of nucleus. A free alpha particle inside nucleus having positive charge should have no difficulty ejecting out of positively charged nucleus so shouldn't coulomb potential energy should be negative rather than positive at the edge of nucleus. Then there will be no need for quantum tunneling.

@bsiix1576 2 жыл бұрын

Yes, this was confusing. It makes sense for an alpha particle brought in from infinity -which is how I've seen it described other places. It also works to explain it in terms of having energy consistent with experiments. It does not mechanistically explain the "barrier" to an alpha coming out of the nucleus. I would like to know what prevents the alpha from leaving the nucleus closer and picking up more energy from the coulomb force - I assume it is actually the short tail of the nucleus potential.

@CrushOfSiel 9 жыл бұрын

I'm trying to reason as to why the coulomb force creates a potential that the alpha particle cannot overcome. I know this is me thinking pretty classically, but is it because the alpha particle is still, "inside" sort of a wall of other protons? Like they're just nudging it backward and it just quite doesn't have the Q to overcome it easily. So it needs to tunnel in order to get on the other side of the rest of the protons? I know you said it's much more fuzzy than that, but I just want some sort of intuitive idea of the situation. Thanks!

@DrPhysicsA 9 жыл бұрын

CrushOfSiel I think that is a good way of thinking classically, although of course we know that in the quantum world its all very different.

@CrushOfSiel 9 жыл бұрын

Heh, thanks. At least I can pretend now that it all makes sense, haha. BTW thanks for all your vids. So many are a nice break from reading the text. I get to just kick back and see how much of the reading has stuck.

@007acreed 7 жыл бұрын

Thx

@Mina-px3zb 5 жыл бұрын

Still not informative enough for me... but so far best video i can find.

@SyFaUQGaming 10 жыл бұрын

Hi, i was wondering what study you did, because you know alot about every type of physics?

@lcchen3095 4 жыл бұрын

I think he just did Nuclear Physics as his main in College and then after his PhD in Nuclear physics he went on to study all the other branches of Physics by himself as in he self-taught himself.Probably he was just passion over Physics.

@SRichards 10 жыл бұрын

When the alpha particle leaves the nucleus might it hit another nucleus and start a cascading effect?

@DrPhysicsA 10 жыл бұрын

Possible. But not so much a cascade effect. The coulomb force will tend to divert the alphas before they ever get into the nucleus.

@SRichards 10 жыл бұрын

DrPhysicsA Would it have to tunnel to get into the next nucleus?

@grobinfgregorius1052 8 жыл бұрын

+S Richards it needs the energy..i think it could tunnel but in accelerators it has the energy to pass the coulomb potential

@billnye8318 8 жыл бұрын

Can you make a video about how we would use the language of mathematics/Physics/chemistry to talk to aliens? Like the voyage space records.

@arjunsharma4699 4 жыл бұрын

2020....

@cadkls 10 жыл бұрын

Just a question, Why does nature prefer lower energy states? What i mean by that is why does nature prefer everything to be stable? Doesn't that go against entropy? That everything always gains entropy? Entropy is way out of my current education range so forgive me if there is something about entropy i am missing.

@Unidentifying 10 жыл бұрын

i think entropy is related to macroscopic configurations which might prefer to be "stable" but in reality are not (it depends on temperature). it is a measure of disorder and therefore related to stability but not perse

@cadkls 10 жыл бұрын

Arigisel Ahasuerus Aebli-von Glarus-Windegg van Oranje-Nassau, Lord of Frisia to Batavia So what you're saying is that entropy and stability are perceptions? I can agree with that. It reminds me of Scrodinger, it implies consciousness inteferes with physics, yet wave-particle duality and his weird cat experiment have been proven using mathematics and experiment. (not sure about the cat one though, but im sure there is some ridiculously complicated maths involved).

@Unidentifying 10 жыл бұрын

in so far as time is also a perception. perhaps. but very fundamental "perceptions".. entropy comes from statistical mechanics/thermodynamics and is also related to computer/information theory. Consciousness interferes with physics, maybe, yet in a sense also creates physics, but many disagree with that

@cadkls 10 жыл бұрын

Arigisel Ahasuerus Aebli-von Glarus-Windegg van Oranje-Nassau, Lord of Frisia to Batavia If entropy is part of statistics, then why is it called the measure of order? Order is merely a perception, so measuring a perception is still subjective to what people percieve.

@Unidentifying 10 жыл бұрын

because that is merely an interpretation of entropy, there are several definitions

@erikziak1249 10 жыл бұрын

144p only? Really? In 2014??? KZfaq???

@harryvirdi6614 9 жыл бұрын

perfect man.....great person thnnks man thumbs up

@easysolution9005 6 жыл бұрын

Nice explanation. I think it would be great if you can make your videos shorter and leave the calculations in a blog or in some documents in cloud drives. Thank you.