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10 videos · 3 h 11 min
Lecture · Royal Institution
The Royal Institution · Sean Carroll · 2020
Sean Carroll tells the story from Planck and Einstein through Bohr, de Broglie and Schrödinger, then argues that the measurement problem is still open and makes his case for the many-worlds interpretation. Notice where the history ends and his interpretation begins.
Explainer · Fermilab
Fermilab · Don Lincoln
Fermilab's Don Lincoln takes on the exact puzzle of Psigor's callout: how can something with no mass carry momentum? He argues that the question comes from misusing equations; compare his resolution with the lesson's route through E² = (pc)² + (mc²)².
Lecture · Erwin Schrödinger International Institute for Mathematics and Physics
Erwin Schrödinger International Institute for Mathematics and Physics (ESI) · Olivier Darrigol
The historian of physics Olivier Darrigol (spelled 'Oliver' in the video title) explains why Louis de Broglie found matter waves and yet did not find Schrödinger's equation, the step this section's callout leaves to Schrödinger. The talk is part 3 of ESI's 'Erwin Schrödinger – 50 years after'. The jump skips the opening remarks and starts at the speaker's introduction. Chapters such as 'Wave synchronization' and 'Relativity and matter waves' go further into de Broglie's own reasoning than the lesson's summary does.
Explainer · Perimeter
Perimeter Institute for Theoretical Physics · Katie Mack · 2023
A short episode from Perimeter Institute's Quantum 101 series with Katie Mack. Watch it alongside Chapter 6.
Series · Perimeter
Perimeter Institute for Theoretical Physics · Katie Mack · 2023
Ten five-minute episodes hosted by the cosmologist Katie Mack: duality, quantization, uncertainty, superposition, entanglement, probability, tunnelling and quantum computing. The friendliest possible on-ramp, and a quick refresher before any chapter.
Explainer · YouTube
Khan Academy Physics
A clear, unhurried blackboard introduction from Khan Academy's physics series: how Louis de Broglie gave matter a wavelength, λ = h/p, and won a Nobel Prize for the idea. Watch for where the formula comes from and how to put numbers into it; Parts 1 to 3 of the lesson take the same road with more history and more precision.
Explainer · YouTube
AT&T Tech Channel
A classic classroom film made around 1961 by Educational Services Incorporated with two Bell Labs scientists: Alan Holden hosts and narrates, and Lester Germer himself re-creates the famous 1927 experiment he performed with Clinton Davisson. The perfect companion to Part 4: the experiment re-created by one of the first people ever to see electrons diffract.
Explainer · MIT
MIT OpenCourseWare
Barton Zwiebach presents de Broglie's proposal at the blackboard in MIT's 8.04 Quantum Physics I (Spring 2016). Expect university-level reasoning about how the energy and momentum relations of the photon were extended to every particle; watch it after Parts 1 and 2.
Explainer · YouTube
Arvin Ash
Arvin Ash asks this section's question about a tennis ball. The lesson answers it with wavelength; he adds the second half of the answer: a big object cannot be cut off from air molecules, scattered light and its own thermal glow, any of which records its path and wipes out interference. Section 8 comes back to that idea. Keep both halves in mind: even a perfectly isolated ball would have a wavelength far too short to show fringes.
Demo · YouTube
National STEM Centre
A four-minute classroom demonstration: an electron beam passed through graphite produces diffraction rings, the same kind of ring pattern G. P. Thomson photographed in 1927. Use section 3's shortcut, λ ≈ 1.226/√V nm: a higher accelerating voltage gives a shorter wavelength, so the rings should shrink whenever the voltage goes up.