I'm little confused. isn't Alpha particle an unstable element? at 9:30 its mentioned that it's very very stable. why doesn't it undergo radioactive decay? since its already an Alpha DECAY particle
Got confused with the magnetic field thing at 8:38 , didn't you mention previously that positrons, which are also beta particles, carry a positive charge?
At around 12:00, why is it that range is independent of the initial energy of alpha particles? If they have more energy, wouldn't the range be greater?
Chris Doner but you do state in the previous question that range IS indeed dependent of the initial energy, not independent as you suggest later, so I do think that is a little mistake. Great video overall though :)
@@munoz5739 As I wrote in my previous reply, range is dependent on initial energy, and therefore, we must assume the initial (kinetic) energy is near constant. The particles were probably passed through a velocity selector so that they would have the same initial kinetic energy. In fact, we use the range to determine the initial energy. We are being asked, what can we conclude from the GRAPH.
If anti-particles simply refer to the same particle with an opposite charge, how can there be anti-neutrinos? Don't neutrinos have no charge anyways (so wouldn't a neutrino be the same thing as an anti-neutrino)? Thanks!
Turns out that there are other types of charge other than electrostatic charge, such as the colour charge, so when I say opposite charge, I am referrring to all types of charge.
+Lionel Messi There are questions on the old paper 3 exams. Look for the particle physics option. This option topic went deeper than the new syllabus does for the SL core, so some of the questions would not be included. I will eventually make a Feynman diagram worksheet with IB style questions, and you will have an option to purchase it for 0.99.
I am confused! .. why is the range independent of the initial energy? I though a higher initial energy means the alpha particles could penetrate more which means increased range. isn't that right?
@@donerphysics He deleted his comment tho. Could you give a brief explanation of why the range is independent of the initial energy (Regarding Alpha Particles' Range)
@@ernestolealislazamora9238 I think I read b) as dependent on the initial energy and then stated that the graph did not show us this. The range is dependent on the initial energy, so the answer is still a).
If neutrinos have some mass (albeit almost none), as opposed to gamma rays and other photons, why do they have a lesser penetration power compared to gamma rays?
Neutrinos basically don't interact with the universe. Gamma photons do. Neutrinos penetrate more than gamma photons. A gamma photon might be absorbed by a nucleus if its energy matches an energy gap in the energy level spectrum of a nucleus but a neutrino won't be.
![Alpha, Beta & Gamma Decay [Complete Discussion]](http://i.ytimg.com/vi/eUEgpcQHzIA/mqdefault.jpg)
![Alpha, Beta & Gamma Decay [Complete Discussion]](/img/tr.png)
This man deserves a medal.
Thank you. Please spread the word about the channel, become a subscriber or a member.
LIFESAVER. THANK YOU.
Yes, I agree with this fine gentleman. Your videos are quite helpful.
I'm little confused. isn't Alpha particle an unstable element? at 9:30 its mentioned that it's very very stable.
why doesn't it undergo radioactive decay? since its already an Alpha DECAY particle
Alpha particles are stable though they are emitted in radioactive decay. If they should attract a couple of electrons, they become a helium atom.
thank you
Hello Mr. Doner,
your videos are very helpful, but can you please make a video on capacitance? thanks.
+Mohammed Shukri
They are available.
ua-cam.com/video/VszHKMR0w0o/v-deo.html
ua-cam.com/video/pOa_imB_WoM/v-deo.html
Got confused with the magnetic field thing at 8:38 , didn't you mention previously that positrons, which are also beta particles, carry a positive charge?
At 1:30, I say that there are positive and negative beta particles. The negative ones are simply electrons.
At around 12:00, why is it that range is independent of the initial energy of alpha particles? If they have more energy, wouldn't the range be greater?
Exactly, so we can assume the alpha particles must have about the same initial kinetic energy, because they all penetrated about the same depth.
Chris Doner but you do state in the previous question that range IS indeed dependent of the initial energy, not independent as you suggest later, so I do think that is a little mistake. Great video overall though :)
@@munoz5739 As I wrote in my previous reply, range is dependent on initial energy, and therefore, we must assume the initial (kinetic) energy is near constant. The particles were probably passed through a velocity selector so that they would have the same initial kinetic energy. In fact, we use the range to determine the initial energy. We are being asked, what can we conclude from the GRAPH.
If anti-particles simply refer to the same particle with an opposite charge, how can there be anti-neutrinos? Don't neutrinos have no charge anyways (so wouldn't a neutrino be the same thing as an anti-neutrino)? Thanks!
Turns out that there are other types of charge other than electrostatic charge, such as the colour charge, so when I say opposite charge, I am referrring to all types of charge.
10:27 - What does range even mean?
In this case, it refers to how far the particles travel before losing all their energy.
hey mr. chris doner, do you know any source I can practice Feynman's diagrams from?
+Lionel Messi
There are questions on the old paper 3 exams. Look for the particle physics option. This option topic went deeper than the new syllabus does for the SL core, so some of the questions would not be included. I will eventually make a Feynman diagram worksheet with IB style questions, and you will have an option to purchase it for 0.99.
+Chris Doner (C. Doner's IB Physics) Alright, I'll do the old papers in the mean time. Thanks!
I am confused! .. why is the range independent of the initial energy? I though a higher initial energy means the alpha particles could penetrate more which means increased range. isn't that right?
At what point in the video are you referring to?
@@donerphysics 11:45
@@guilhermefreire8093 See comments under Riyadh Baksh below (not the one about the neutrinos.
@@donerphysics He deleted his comment tho. Could you give a brief explanation of why the range is independent of the initial energy (Regarding Alpha Particles' Range)
@@ernestolealislazamora9238 I think I read b) as dependent on the initial energy and then stated that the graph did not show us this. The range is dependent on the initial energy, so the answer is still a).
What is beyond Gamma Rays? There has to be higher frequencies.
cosmic rays.
If range is independent of the initial energy then how come greater KE means greater travel ?
See the conversation with Riyadj Balsj
If neutrinos have some mass (albeit almost none), as opposed to gamma rays and other photons, why do they have a lesser penetration power compared to gamma rays?
Neutrinos basically don't interact with the universe. Gamma photons do. Neutrinos penetrate more than gamma photons. A gamma photon might be absorbed by a nucleus if its energy matches an energy gap in the energy level spectrum of a nucleus but a neutrino won't be.