18. Ion-Nuclear Interactions II - Bremsstrahlung, X-Ray Spectra, Cross Sections

[@mitocw]

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[@jacobjohn378]

"Knowledge brings fear" Dr. Michael Short is one quotable guy.

[@hellokim_kr]

Mom: What did you learn today? Me: "A GIGA ELECTRONVOLT SPINNING NINJA STAR OF DEATH" 30:37

[@WarBlog]

This is a phenominal lecture. I only did maths at university for the first year but it was the greatest. This clearly demonstrates what the human mind is capable of achieving given a certain abstract series of rules, which are based on physical reality in this example, and its just so sad that most people will never take it further. Seems that its almost worth just going to university so you can get the thrill of doing this sort of maths/logic and then teach it, to continue doing it for years. I always thought that teaching was what you did when you couldn't get the job. I love the way he asked questions like, high much enegy can one particle pass on to another, and no one has a clue, all of it!! Of course!! Or a good shielding material. I wish I could start all over again. To think that most people doing this are aged 18-22, seems like such a shame. For many people, their minds will never reach such heady heights as they do at university, and ironically they have no idea of that.

[@VeteranVandal]

"I always thought that teaching was what you did when you couldn't get a job." Who taught you this or how did that thought came to your head? Also, as a suggestion, I'd tell you to take a few courses (if you didn't already, I kinda have that impression) before this one. Mit numbers then and I don't remember the numbers, but they'd be the first physics course (this scattering math is done there for the first time, or at least the mechanical contact version of it, and it baffles me that isn't called out all of the time in this course) and probably only the first 2 calculus courses - maybe only the first one is enough, but I don't remember exactly the subjects they teach and in what sequence. Btw, this scattering here is very similar to Rutherford's. This course I think could be done in parallel with a classical mechanics course, since you don't actually use a lot of classical mechanics concepts, instead relying in a more Newtonian approach. In spite of your comment... This isn't even a very hard course for physics, tho I don't know if the entire class here is of physicists (in fact, I doubt it is). If you have a very small college level knowledge of electromagnetism and a solid mechanics, this is simple. In fact I think the differential equations are the hardest part of the course and they are merely technical ways of calculating solutions to simple differential equations. The course that follows this one, tho... Is more complex. In 1 year, you could actually learn all what I delineated above. It is hard, tho, to ask anyone to take all that time to sate such curiosities, specially in a world were most people work 5+ days a week. Apparently our great idea of a society is a group of people alienated to the point of idiocy working for survival day in day out. As if it was impossible to do something else. But I'll not rant about this... I do think that, if you could get this far, you should consider taking the other courses I delineated above, since you clearly dig the subject.

[@palharley]

So I work nights, with a fair bit of idle time at times. What do I do with said time MIT 2201. To my surprise today you asked practical questions, I had correct answers. I could only imagine how much I would get if it did the reading and reinforcement with some of the math. I love the concepts, enjoy the reductions that fill six boards. Thanks Prof Short, great job.

[@mdfaizanshakeel5591]

This guy is amazing

[@augustinemmuogbana3382]

Amazing lectures

[@brainstormingsharing1309]

Absolutely well done and definitely keep it up!!! 👍👍👍👍👍

[@jacobjohn378]

Plane of death. Well said sir.

[@ehfik]

indeed!

[@pauliusc]

Knowledge brings fear!

[@VeteranVandal]

When masses are equal, all of the energy can be transferred under contact potentials. It is interesting that in this scattering unlike in quantum mechanical scattering, the area of the cross section is proportional to the literal electron cross section if you imagine it a sphere. They didn't think Rutherford scattering is important? Like... The thing that told us nuclear physics us a thing isn't important for this course. Oof.

[@miguichopemigui6736]

So in which book can we look for this content :o griffith?

[@roxybot9840]

Just put our area dosimeter in the room that entombs the old cyclotron today, it was decommissioned 30 years ago. I still worry sometimes about going down in there.

[@VeteranVandal]

Well... Do you have a Geiger counter? If you do, you could basically visit to see if any radioactive material exists there. It'd actually be pretty cool. Unless of course they closed it indefinitely. I get fearing it, but if you have a detector you can listen to the radiation literally as it happens. And we know the doses one can take safely.

[@roxybot9840]

@@VeteranVandal its Tritium is the problem, geigers dont work well. I have to use swipes and analyze by scintillator

[@renex8434]

Did not know that the german word Bremsstrahlung is used in english. 🙂

[@heysemberthkingdom-brunel5041]

You'd be surprised how many leading Manhattan-Project scientists lived and worked in Germany, before... you-know-what... Nuclear fission was discovered by an experiment made by Otto Hahn (who stayed in Germany) on the instructions of Lise Meitner (who had to leave) with Meitner and her nephew (who also fled) figuring out what had happened and why...

[@ehfik]

check the article /List_of_German_expressions_in_English on wiki!

[@dannobman07]

I’ll bet this guy is really good at chess ….. But lousy at baseball .

[@guiuismo]

what