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10 videos · 5 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 · YouTube
Khan Academy
A clear, chaptered walk through almost exactly what this session covers: how emission depends on frequency, the threshold, why intensity changes only the number of electrons, why the wave model fails, and how photons of energy hf fix it, ending with the photovoltaic effect behind solar cells. Watch for the moment intensity and frequency part ways; it is the heart of the lesson.
Explainer · MIT
MIT OpenCourseWare
Barton Zwiebach takes on the photoelectric effect in MIT's 8.04 Quantum Physics I (Spring 2016). Expect a university-level blackboard treatment; watch it after the lesson, with Einstein's equation from Part 4 and the stopping-potential graph from Part 5 in mind.
Lecture · YouTube
Physics Explained
How the light quantum was really born: not from the photoelectric effect, but from Einstein's 1905 thermodynamic argument about blackbody radiation, running from Wien's law and Boltzmann's entropy to the photoelectric equation and Millikan's confirmation. The perfect bridge between the last chapter and this one.
Demo · Institute of Physics
Institute of Physics
A three-minute classroom demonstration from the Institute of Physics and the National STEM Learning Centre: a zinc plate on a gold-leaf electroscope, lit with ultraviolet. This is the bench from the hook and Hallwachs's 1888 experiment; watch the leaves and keep in mind that only a negatively charged plate loses its charge.
Demo · YouTube
The Action Lab
The Action Lab shows the photoelectric effect two different ways. The jump lands on the 'Photoelectric Effect' chapter, followed by 'Low Frequency Light', 'Neon Bulbs' and 'Frequency': watch for the threshold, section 2's first fact, and rewind to the 'Electroscope' and 'Binding Energy' chapters for section 1.
Explainer · YouTube
FloatHeadPhysics
A story-driven history from 'The tiny lab accident' to 'Einstein's epiphany' (16:14). The jump starts at the chapter 'Lenard's trigger hypothesis' (7:27), the classical rescue in which light merely releases electrons that already carry their energy, followed by 'Trigger hypothesis is in trouble' (9:03): section 3's failures, told as a story. Rewind to 0:00 for the discovery chapters.
Documentary · Caltech
caltech · David Goodstein
Caltech's classic telecourse episode on how evidence that light can act like a particle led to quantum mechanics. After an opening on Planck and glowing bodies comes its photoelectric segment, with Einstein, electrons in a metal and the work function, and Millikan's lab: an animated second pass over sections 4 and 5, before the episode moves on to de Broglie, Bohr and Heisenberg.
Lecture · MIT
MIT OpenCourseWare · David Kaiser
Physicist and historian David Kaiser's lecture on the 'old quantum theory' of light. His posted notes show the arc: blackbody radiation and Planck's h, Lenard's threshold and Einstein's 1905 'heuristic' light quanta, some fifteen years of skepticism, then Compton scattering. History with the physics left in; the deeper setting for section 4.
Explainer · YouTube
Dr. Jorge S. Diaz
Physicist Jorge Diaz's detailed presentation of how Millikan tested Einstein's light theory. Read it against section 5: the straight line of stopping potential against frequency, its slope h/e, and Millikan accepting the equation long before he accepted the photon.