thank you so so much! never understood any of this, the best explanation i ever got was that strong forces hold a nucleus together and that weak forces appear in feynman diagrams but thats all. this makes so much sense thank you!
For my students, I choose the option and we do Engineering physics. I also made videos for the relativity option. Relativity tends to be abstract for most students. I would say the others are equally easy, or hard depending on your perspective.
Great video. Thanks for the work putting it together. One question. At approx. 2:40 in the video you say "this photon here'could be absorbed by that negative charge'. Is it really a photon that is being emitted and absorbed or a 'photon-like' disturbance that is being emitted and absorbed?
Electrostatically protons repel each other, but they also attract each other via the strong force. The strong force dominates at very short distances and applies to both protons and neutrons, so the diagram could show either.
Usually by using conservation of charge at the vertex. So for instance, if neutron changes into a proton and electron as in beta decay, we need a negative charge for the exchange particle as we have a neutron becoming a proton and an exchange particle.
yeah this is all totally appropriate for 16-17 year olds. The IB course really is a virtue-signalling course and is disgracefully ignorant of all physics research into the introductory teaching of the subject. I'm afraid lines such as " well you don't need to know about the Pauli exclusion principle"....but hey, its ok to listen to dubious analogies re exchange particles, the properties of spin and colour. Why are no physics teachers , except myself, just not calling this out for the nonsense it is.
There are ways of introducing these things that garner interest (in some) but clearly can not be part of the tested syllabus. Unfortunately, the content on the exam is so large that teachers resort to all sorts of tricks just to complete the content. It is not unique to the IB but generally teachers are being asked to spread themselves very thin with a wide range of other curriculum objectives that are based on incoherent mixtures of previous approaches.
Thank you so much! I just couldn't understand this section when my teacher taught it, but your six videos on 7.3 helped me understand!
thank you so so much! never understood any of this, the best explanation i ever got was that strong forces hold a nucleus together and that weak forces appear in feynman diagrams but thats all. this makes so much sense thank you!
Hello Mr Donner,
I just wanted to ask you what is in your opinion the easiest option for physics SL.
Thank you,
A scared IB student.
For my students, I choose the option and we do Engineering physics. I also made videos for the relativity option. Relativity tends to be abstract for most students. I would say the others are equally easy, or hard depending on your perspective.
4:06 does Newtonian laws work in Quantum world
Basically yes. As we move from quantum conditions to macro conditions, quantum mechanics must follow Newton's laws.
Great video. Thanks for the work putting it together. One question. At approx. 2:40 in the video you say "this photon here'could be absorbed by that negative charge'. Is it really a photon that is being emitted and absorbed or a 'photon-like' disturbance that is being emitted and absorbed?
Right, I am using the word photon as a short-form, for "photon like disturbance".
Great. Thanks for the clarification.
Wonderful anology 👍🤗
Glad you think so!
Hi @@donerphysics , I have my final exam day after Tomorrow and I'm really scared for my paper 1, can you give me few tips on that?
@@HardikKundalwal How did the exam go? Mine is M23
Very great video. Just one question: at 17:26 , how come there are two protons attracting each other? Should it be one proton and one neutron? thanks
Electrostatically protons repel each other, but they also attract each other via the strong force. The strong force dominates at very short distances and applies to both protons and neutrons, so the diagram could show either.
Chris Doner thank you very much，your videos are very helpful for revision.
Sir, I have one question: How do we know if it is a W+ or W- or Z boson in a weak nuclear interaction?
Usually by using conservation of charge at the vertex. So for instance, if neutron changes into a proton and electron as in beta decay, we need a negative charge for the exchange particle as we have a neutron becoming a proton and an exchange particle.
@@donerphysics so if it was positron, it would be W+?
yup.
@@donerphysics ok thank you very much.
do we call red, blue and green as quarks? or just call them as colors?
We could talk of a red up quark. Think of the red as a different type of charge for the quark.
hey, is this video valid for the may 2022 physics HL syllabus?
It is 7.3 from the core syllabus.
@@donerphysics thank you so much man I wouldn’t have been able to do physixs hl without you
3:20 we can also understand this by "like charges repel each other''
We are trying to explain why like charges repel.
4:33 sus, among us
yeah this is all totally appropriate for 16-17 year olds. The IB course really is a virtue-signalling course and is disgracefully ignorant of all physics research into the introductory teaching of the subject. I'm afraid lines such as " well you don't need to know about the Pauli exclusion principle"....but hey, its ok to listen to dubious analogies re exchange particles, the properties of spin and colour. Why are no physics teachers , except myself, just not calling this out for the nonsense it is.
There are ways of introducing these things that garner interest (in some) but clearly can not be part of the tested syllabus. Unfortunately, the content on the exam is so large that teachers resort to all sorts of tricks just to complete the content. It is not unique to the IB but generally teachers are being asked to spread themselves very thin with a wide range of other curriculum objectives that are based on incoherent mixtures of previous approaches.