In the course
Keep watching
10 videos · 3 h 38 min
Demo · Utah State University
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.
Lecture · Yale
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
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.
Lecture · MIT
MIT OpenCourseWare · Robert Field · 2017
The lecture from MIT 5.61 Physical Chemistry (Robert Field, 2017) that goes with Chapter 2. The whole course is in the Lecture Hall.
Course · MIT
MIT OpenCourseWare · Robert Field · 2017
Quantum mechanics as chemists use it, taught by the spectroscopist Robert Field: the photoelectric effect and Compton scattering, boxes and oscillators, hydrogen and many-electron atoms. Strong on spectroscopy, the experimental face of quantization.
Explainer · YouTube
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.
Explainer · YouTube
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 · Bell Telephone Laboratories
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
Ri Archives · Sir Lawrence Bragg
From the Royal Institution's own film archive: the Nobel laureate Sir Lawrence Bragg, the Ri's director from 1954 to 1966, explains electromagnetic waves with models and a reconstruction of Faraday's induction experiment, surveys their range, and experiments with a klystron. He then measures wavelengths with standing waves and finishes by sending electromagnetic waves through Young's pinholes, so it previews sections 5 and 8 as well.
Lecture · Royal Institution
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.