Quantum electrodynamics enabled?

AI Thread Summary
Quantum electrodynamics (QED) has significantly influenced the development of technologies such as lasers and masers, which are direct applications of its principles. The discussion emphasizes the importance of understanding QED for grasping modern technological advancements. Readers are encouraged to explore Richard Feynman's book, "QED: The Strange Theory of Light and Matter," for deeper insights into the theory. The conversation highlights a desire to identify more products and technologies that owe their existence to QED. Overall, the impact of QED on technology is profound and far-reaching.
Mechanovis
Im wondering what products/technologies that would not have been poosible without the theories of Quantum electrodynamics, not things that these theories appear to explain.
 
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The ideas which lead to the laser (and its forerunner, the maser) come straight from quantum theory.
 
If you are interested in QED, you should read

QED The Strange Theory of Light and Matter by Richard Philips Feynman
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
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