Richard Feynman QED Lecture 2, Reflection and Transmission : 1/7

Part 2: http://www.youtube.com/watch?v=Sccs-XG33EU&feature=channel_video_title

Richard Feynman gives us a lecture on Quantum electrodynamcis, the theory of photons and electron interactions which incorporates his unique view of the fundamental processes that create it. one of the 3 winners of the 1965 Nobel prize in Physics for his work, Feynman is was an expert on quantum mechanics and developed the Path Integral formulation of Relativistic Quantum mechanics, used in Quantum Field Theory, interpreted the Born series of scattering amplitudes as vertices and Green's function propagators in his famous diagrams, the Feynman Diagrams, and also worked on the fundamental excitations in Liquid Helium leading to a correct model describing superfluidity using phonons, maxons and rotons to describe the various excitation curves.
other fields of work include the Feynman-Hellmann Theorem, which can relate the derivative of the total energy of any system to the expectation value of the derivative of the Hamiltonian under a single parameter, e.g volume.
he also worked on the Rogers Commission report during the investigation of the 1986 Space Shuttle Challenger disaster, where Feynman famously demonstrated how the Booster Rocket O-rings, which are elastic sealing joints, became less resilient and subject to seal failures at ice-cold temperatures by immersing a sample of the material in a glass of ice water- his high intelligence and independant way of looking at the world often made him "a real pain" in the eyes of other, less skilled, Commission members.
Feynman's own investigation reveals a disconnect between NASA's engineers and executives that was far more striking than he expected. His interviews of NASA's high-ranking managers revealed startling misunderstandings of elementary concepts, such as safety proceedures.
Although Feynman got plenty of media coverage due to him being on the Commission, he was often told to stay quiet about NASA's more sinister secrets and tactics in space exploration.

Category:

Science & Technology

Tags:

• Richard
• Feynman
• Quantum
• electrodynamics
• Field
• Theory
• Mechanics
• photons
• electrons
• electromagnetism
• nuclear
• forces
• fundamental
• physics
• lectures
• QED
• elementary
• particles
• chemistry

[CamiloSanchez1979]

Did he have cancer by the time he did this?

[MuonRay]

@CamiloSanchez1979 He developed 2 rare forms of cancer in the late 1980's, around 1987 I believe and died shortly after; definately before I was born; a tremendous loss to the scientific community. However his massive contrabutions to science have allowed him to become probably the most celebrated scientist of the 20th Century, after Einstein, in that he was pretty much in every form of physics research; The path Integral and Feynman-Kac theorem, the Feynman-Hellmann theorem, ect.

[MuonRay]

@CamiloSanchez1979 His last recorded words were "I'd hate to die twice. Its so boring" which is very appropriate as he was like the candle that burned twice as bright but for half as long; or in QED terms the propogator that acts half as long but couples twice as strongly.

[kjrunia]

Thank you so much for putting this up! What better way to spend another rainy Saturday (I live in the Netherlands, where summer can feel like fall)?

[MuonRay]

@kjrunia I will upload part 3 this week and part 4 which will be the complete series. any other richard feynman videos of relavance I will put up aswell. I would be interested in putting up slides on Quantum Field Theory awell, if I have the time before term starts again.

[x3llence]

i would give 500 to 1000 bucks to buy the full lecture series in HD,

[cormisterio]

@kjrunia haha, i share the same idea (and the same place of living).

@MuonRay Thanks for the video!

[emily7022]

thank you! i can't wait for part 3 and 4.

[kjrunia]

@MuonRay Truly awesome!