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10 videos · 4 h 3 min

  • Demo · Bell Telephone Laboratories

    AT&T Archives: Similiarities of Wave Behavior (Bonus Edition)

    AT&T Tech Channel · J. N. Shive

    A 1959 Bell Labs teaching film in which J. N. Shive demonstrates wave behaviour on the wave machine named after him: watch any one rod as a pulse passes, and see it only twist about the central spine while the pattern runs the length of the machine. The start skips to the 'Wave Behavior' chapter (1:42); 'Superposition Behavior' (7:09) previews section 4, and the later chapters on impedance and partial reflection are optional.

  • Lecture · Royal Institution

    Young and the Wave Theory of Light - with Sir Lawrence Bragg

    Ri Archives · Sir Lawrence Bragg

    Bragg sets out the contest between the particle and wave theories of light, builds up interference (2:26), reaches Young's experiment (9:52), then turns to sharp shadows and light bending round edges (13:15 onwards). A companion to this section's history from the institution where Young himself lectured.

  • Explainer · YouTube

    Traveling Waves: Crash Course Physics #17

    CrashCourse

    A brisk, well-animated tour of the vocabulary this lesson builds on: crests and troughs, amplitude, wavelength and frequency, transverse versus longitudinal waves, and constructive and destructive interference. Listen for two lines we will lean on hard: wave speed is wavelength times frequency, and a wave's energy grows as the square of its amplitude.

  • Lecture · MIT

    20. Interference, Soap Bubble

    MIT OpenCourseWare

    A full lecture from MIT's 8.03SC Physics III: Vibrations and Waves (Fall 2016). Prof. Yen-Jie Lee adds two electromagnetic waves on the blackboard, shows how the resulting intensity depends on their phase difference, then uses path difference and the phase flip on reflection to explain the colours of a soap film. Best watched after the lesson.

  • Explainer · YouTube

    e^(iπ) in 3.14 minutes, using dynamics | DE5

    3Blue1Brown

    Grant Sanderson shows why e^(iθ) walks around a circle, which is exactly the rotating-arrow picture behind the phasors in Part 7. Four minutes that make Euler's formula feel inevitable.

  • Demo · Utah State University

    Interference Demo: Speakers

    Physics Demos · Boyd F. Edwards

    This section's two-loudspeaker example made real, from Boyd F. Edwards' Utah State University demonstration series: two speakers play the same 2,000 Hz tone (a wavelength of about 17 cm in air) and set up an interference pattern in the room. Check each loud and quiet spot against the rule: whole wavelengths of path difference reinforce, odd half-wavelengths cancel.

  • Explainer · YouTube

    The Original Double Slit Experiment

    Veritasium

    Derek Muller tells the story of the experiment that, just over two hundred years ago, made the case that light is a wave, and recreates it with sunlight and household materials: the beginner's version of this section in eight minutes. Keep it classical for now; the same experiment with single particles is chapter 7's story.

  • Explainer · YouTube

    The Born Rule

    Looking Glass Universe

    Mithuna Yoganathan's short introduction to the Born rule, with chapters on complex numbers as vectors (1:00) and standard complex notation (2:58). It is this section's 'seed of the Born rule' callout in its quantum form, and a preview of section 7's complex arrows.

  • Lecture · Yale

    18. Wave Theory of Light

    YaleCourses · Ramamurti Shankar

    The deep dive: the Yale lecture just before Ramamurti Shankar's quantum unit. The start jumps to the 'Young's double slit experiment' chapter (8:20), where he insists that intensities do not add, writes the combined intensity as (ψ₁ + ψ₂)², and redoes the sum with complex exponentials and arrows 'in anticipation of quantum mechanics': sections 5 to 7 at university pace.

  • Lecture · MIT

    Necessity of complex numbers

    MIT OpenCourseWare · Barton Zwiebach

    A segment of MIT 8.04 Quantum Physics I (Spring 2016): Barton Zwiebach reviews this section's toolkit (the conjugate, |z|² = z·z*, e^(iθ) = cos θ + i sin θ), then explains why the wavefunction must be complex, since the Schrödinger equation contains i, and how Born's |ψ|² turns it into the real probabilities we measure. The payoff of this section's last paragraph: classically the complex arrow is auxiliary, in quantum mechanics it is essential.