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Does light take all possible paths at the same time? 🌏 Get exclusive NordVPN deal here ➵ It’s risk free with Nord’s 30 day money-back guarantee!✌

A massive thank you to Dr. Andrew Mitchell for all his help and expertise. If you want to delve further into this topic then we highly recommend his lecture on Classical physics derived from quantum mechanics:

We’re incredibly grateful to Prof. David Kaiser, Prof. Steven Strogatz, Prof. Geraint F. Lewis, Elba Alonso-Monsalve, Prof. Christopher S. Baird, Prof. Anthony Bloch, and Prof. Stephen Bartlett for their invaluable contributions to this video.

A special thanks to Mahesh Shenoy from FloatHeadPhysics for his help with this video. Check out his excellent intuitive video on the UV Catastrophe here (Sep 2024):

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0:00 What path does light travel?
2:40 Black Body Radiation
6:47 How did Planck solve the ultraviolet catastrophe?
9:42 The Quantum of Action
13:25 De Broglie’s Hypothesis
15:16 The Double Slit Experiment
20:00 How Feynman Did Quantum Mechanics
25:01 Proof That Light Takes Every Path
31:16 The Theory of Everything

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Sign up to our Patreon to watch the Q&A for free:

Try Snatoms! A molecular modelling kit I invented where the atoms snap together.


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References:
Armin Hermann (Nov 1974). The Genesis of Quantum Theory (1899-1913). -
Richard P. Feynman (1985). QED The Strange Theory of Light and Matter. -
A fantastic book on the history of the Principle of Least Action: Rojo, A. and Bloch, A. The
Principle of Least Action: History and Physics. -
Coopersmith, J. (2017). The lazy universe: an introduction to the principle of least action. Oxford University Press. -
PBS Space Time. (Nov 2021) -
Sabine Hossenfelder. (May 2022) -
Max Planck (1901). On the Law of Distribution of Energy in the Normal Spectrum. Annalen der Physik -
Paul Ehrenfest (1911). Welche Züge der Lichtquantenhypothese spielen in der Theorie der Wärmestrahlung eine wesentliche Rolle?. Wiley Online Library -
Nils-Erik Bomark and Reidun Renstrøm (Aug 2023). The Ultraviolet myth. Proceedings of Science -
Planck's law. In Wikipedia -
PBS Space Time. (Jul 2017). -
Einstein and The Photoelectric Effect. (Jan 2005) via APS News -
Louis de Broglie (1924). On the Theory of Quanta. -
Larry Sorensen (2012). Path Integrals 1. University of Washington -
Feynman’s Method of “A Particle Exploring All Possible Paths”. (Mar 2018) via Pure Dhamma -
A great intuitive video on the Feynman path integral approach -
Origins of Quantum Theory. via University of Pittsburgh -

Images & Video:
Nobistor Altona 1880 via NDR -
Edison incandescent lights by William J. Hammer via Wikimedia Commons -
The full expanded form of the Standard Model Lagrangian by Chen Ning Yang et al. via Wikipedia -
Muon Ray. (2011).
Muon Ray. (2011).
Bohrs Atomic Model via EEEGUIDE.COM -

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Special thanks to our Patreon supporters:
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Directed by Casper Mebius
Written by Casper Mebius and Derek Muller
Edited by Trenton Oliver and Peter Nelson
Animated by Fabio Albertelli, Mike Radjabov, Ivy Tello, Andrew Neet and Emma Wright
Illustrations by Jakub Misiek, Tommy A. Steven and Cainejan Esperanza
Filmed by Derek Muller and Casper Mebius
Produced by Casper Mebius, Derek Muller, Rob Beasley Spence, Gabe Strong, Geeta Thakur, Emilia Gyles, Zoe Heron, Emily Zhang and Tori Brittain

Thumbnail contributions by Ignat Berbeci, Ben Powell, Jakub Misiek, Ren Hurley, and Peter Sheppard

Additional video/photos supplied by Getty Images and Storyblocks
Music from Epidemic Sound

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