Stern-Gerlach experiment by Ciro Santilli 37 Updated +Created
Originally done with (neutral) silver atoms in 1921, but even clearer theoretically was the hydrogen reproduction in 1927 by T. E. Phipps and J. B. Taylor.
Video 1.
The Stern-Gerlach Experiment by Educational Services, Inc (1967)
Source. Featuring MIT Professor Jerrold R. Zacharias. Amazing experimental setup demonstration, he takes apart much of the experiment to show what's going on.
Model of the solar system by Ciro Santilli 37 Updated +Created
Meritocracy by Ciro Santilli 37 Updated +Created
SARS-CoV-2 cell entry by Ciro Santilli 37 Updated +Created
Video 1.
Model of Membrane Fusion by SARS CoV-2 Spike Protein by clarafi (2020)
Source.
Atomic orbital by Ciro Santilli 37 Updated +Created
In the case of the Schrödinger equation solution for the hydrogen atom, each orbital is one eigenvector of the solution.
Remember from time-independent Schrödinger equation that the final solution is just the weighted sum of the eigenvector decomposition of the initial state, analogously to solving partial differential equations with the Fourier series.
This is the table that you should have in mind to visualize them: en.wikipedia.org/w/index.php?title=Atomic_orbital&oldid=1022865014#Orbitals_table
Satanism by Ciro Santilli 37 Updated +Created
Yang-Mills theory by Ciro Santilli 37 Updated +Created
Raspberry Pi 3 by Ciro Santilli 37 Updated +Created
SoC: BCM2837
Serial from cat /proc/cpuinfo: 00000000c77ddb77
Down quark by Ciro Santilli 37 Updated +Created
Derivation of the quantum electrodynamics Lagrangian by Ciro Santilli 37 Updated +Created
Like the rest of the Standard Model Lagrangian, this can be split into two parts:
Video 1.
Deriving the qED Lagrangian by Dietterich Labs (2018)
Source.
As mentioned at the start of the video, he starts with the Dirac equation Lagrangian derived in a previous video. It has nothing to do with electromagnetism specifically.
He notes that that Dirac Lagrangian, besides being globally Lorentz invariant, it also also has a global invariance.
However, it does not have a local invariance if the transformation depends on the point in spacetime.
He doesn't mention it, but I think this is highly desirable, because in general local symmetries of the Lagrangian imply conserved currents, and in this case we want conservation of charges.
To fix that, he adds an extra gauge field (a field of matrices) to the regular derivative, and the resulting derivative has a fancy name: the covariant derivative.
Then finally he notes that this gauge field he had to add has to transform exactly like the electromagnetic four-potential!
So he uses that as the gauge, and also adds in the Maxwell Lagrangian in the same go. It is kind of a guess, but it is a natural guess, and it turns out to be correct.
Talk title shown on intro: "Today's Answers to Newton's Queries about Light".
6 hour lecture, where he tries to explain it to an audience that does not know any modern physics. This is a noble effort.
Part of The Douglas Robb Memorial Lectures lecture series.
Feynman apparently also made a book adaptation: QED: The Strange Theory of Light and Matter. That book is basically word by word the same as the presentation, including the diagrams.
According to www.feynman.com/science/qed-lectures-in-new-zealand/ the official upload is at www.vega.org.uk/video/subseries/8 and Vega does show up as a watermark on the video (though it is too pixilated to guess without knowing it), a project that has been discontinued and has has a non-permissive license. Newbs.
4 parts:
This talk has the merit of being very experiment oriented on part 2, big kudos: how to teach and learn physics
Video 1.
Richard Feynman Quantum Electrodynamics Lecture at University of Auckland (1979) uploaded by Trev M (2015)
Source. Single upload version. Let's use this one for the timestamps I guess.
Intel quantum computer by Ciro Santilli 37 Updated +Created
Video 1.
Architecture All Access: Quantum Computing by James Clarke (2021)
Source.
Python web framework by Ciro Santilli 37 Updated +Created
Transcriptional regulation by Ciro Santilli 37 Updated +Created
Wien approximation by Ciro Santilli 37 Updated +Created

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