Domain: Engineering — Nuclear Engineering
Target concept: Quantum Mechanics

Video generation prompt: Electron wave-particle duality demonstration device (including a nuclear radiation-excited electron source, double slits, and a fluorescent screen). Turn on the electron source, adjust the electron beam to a low intensity, illuminate the double slits for 5 seconds, and focus the image on the fluorescent screen.

Evaluation guide:
(i) Target concept: Single-electron interference demonstrating quantum wave-particle duality via statistical accumulation of particle detections into a wave interference pattern.
Minimum mechanism: Electrons must be emitted individually (low intensity), pass through two spatially separated apertures (not one), and be detected as localized energy deposits on a phosphor screen whose cumulative spatial distribution reflects |ψ₁ + ψ₂|² interference.
(ii)Storyline: [Frame 0–1] Electron source activates (indicator glow or label change); [Frame 2–3] Sparse beam propagates linearly from source toward double slits; [Frame 4–5] Beam passes through *both* slits (two divergent faint paths visible); [Frame 6–10] Individual flashes appear stochastically on screen, increasing in count and revealing growing density contrast (highest near center, zero at predicted minima), all within fixed camera frame, no viewpoint shift, no object motion.

Manual:
Experimental Procedure
1. Activate radiation-excited electron source.
2. Direct low-intensity electron beam toward double-slit barrier.
3. Observe accumulation of discrete flashes on fluorescent screen over 5 seconds.
Observation of Experimental Phenomena
Discrete point-like flashes appear individually on screen, accumulating non-uniformly into alternating high-density and zero-density vertical bands — symmetric about screen center — confirming wave-like interference superimposed on particle-like detection.
Summary of Experimental Principles
Electrons exhibit wave-particle duality: as particles, they strike screen at discrete points; as waves, their probability amplitudes interfere after passing through both slits, producing observable interference maxima and minima.

Prompt Grounding rubric:
level_1: None of the three core objects (the electron source, the double-slit barrier, or the fluorescent screen) is shown, or the demonstration depicts visible photons/light instead of an electron beam, or the setup is something unrelated (e.g., water waves or a laser with no electron-source framing).
level_2: At least one of the three core objects appears, but it is shown in a form inconsistent with its role (for example the double slit looks like a single slit or a diffraction grating, the electron source looks like an ordinary light bulb, or the fluorescent screen is just a blank wall), and no discernible source-to-slits-to-screen sequence is shown.
level_3: The electron source (a compact emitter with a subtle glow or label), the double-slit barrier (an opaque plate with two parallel narrow vertical openings), and the fluorescent screen (a flat surface that lights up where struck) are all present and identifiable, the source is shown activating, and the beam is shown reaching and passing through the slit region; but the order is ambiguous (e.g., the screen lights up before the beam reaches the slits) or the three objects aren't aligned in a single straight line.
level_4: The three objects sit in a straight-line arrangement (source, then slits, then screen), and the order is strict: the source activates, then the beam travels to and through the slits, then the screen shows some visible response, with no missing object, mislabeling, or reordering, and the beam stays sparse (individual traces or dots) rather than a continuous stream; a single non-core presentation flaw is tolerated, such as a label being briefly hard to read or the beam's path being partially obscured for a moment by an on-screen annotation.
level_5: The three objects are correctly shaped and positioned in exact collinear order with no misalignment, and the sequence is unambiguous and non-overlapping throughout: an activation cue at the source (e.g., a switch or indicator light), then the beam visibly traveling toward the slits as a sparse stream, then the beam visibly dividing into two paths as it passes through both slits, then the screen beginning to visibly respond, with no reversal, skipped step, or stray visual artifact anywhere in the clip.

Scientific and Causal Correctness rubric:
level_1: The screen contradicts wave-particle duality outright: it shows only two bright bars with no interference structure (a purely classical-particle pattern), or one continuous bright band with no discrete impacts (a purely classical-wave pattern), or no response at all despite the source activating, or the impacts appear in visible-light colors like red or green typical of a laser rather than electron detections.
level_2: The screen shows a static, uniform glow with no spatial variation, or exactly two bright regions lined up with the slits and nothing else, or interference-like fringes appear without ever showing discrete impact events, or the beam itself is rendered as a continuous bright stream before it even reaches the screen, violating the low-intensity, single-electron premise.
level_3: The screen shows discrete point-like flashes appearing one at a time, spread across the screen's width including the central region and beyond the positions directly behind each slit; the beam stays sparse rather than a continuous stream; but not enough flashes have accumulated yet to make out any fringe structure, or flashes only show up directly behind the slits with none appearing off-axis.
level_4: At least five discrete flashes accumulate with higher density near the center and fewer toward the edges, beginning to suggest banded structure (three to five brighter zones with darker gaps between); every flash stays point-like rather than smeared; the beam stays sparse throughout, though one issue remains, such as flashes appearing before the beam reaches the slits, inconsistent flash colors (a mix of green, yellow, and blue rather than one consistent color), or no visible difference between the beam-on and beam-off states.
level_5: Every flash is the same size, shape, and single color; the flashes build up exclusively into a clear interference pattern: alternating bright bands and empty gaps, symmetric about the screen's center; the pattern only starts forming after the beam has passed through both slits, never before; no flash appears outside the screen or behind the barrier; and the full causal sequence is visible end to end: source activates, beam passes through both slits, individual flashes appear, and they accumulate into the interference pattern.

Spatiotemporal Consistency rubric:
level_1: The slits appear or disappear abruptly, the screen rotates or flips, the beam jumps discontinuously between positions, the lighting swings violently between frames (e.g., full brightness to black to full brightness in successive frames), or the slit barrier visibly splits into two floating pieces.
level_2: At least one major break occurs: the electron source vanishes and reappears in a new spot, the double slits shift sideways mid-clip, the fluorescent screen's brightness swings by more than half from one frame to the next, the beam bends unnaturally (a sharp corner instead of a smooth path) or changes thickness inconsistently, or the camera viewpoint switches (e.g., close-up to wide shot to top-down) with no smooth transition.
level_3: The source, slit barrier, and screen all stay in the same place relative to each other throughout, with no teleporting, rotating, or resizing; the beam moves smoothly from the source toward the slits and onward to the screen; the screen's brightness builds up gradually as flashes accumulate; and the lighting stays even with no strobing or sudden directional shifts, though the slit position may show a faint, barely perceptible tremor between frames, or one brief frame may show motion blur that blurs a flash's exact location.
level_4: Beyond that, there's no object displacement, deformation, or occlusion; the beam stays continuously visible and unbroken during its transit; the flashes appear with steady timing rather than clustering into sudden bursts that would violate the low-intensity premise; the screen holds a rigid, flat orientation and consistent perspective; and the lighting and shadows stay physically coherent, with no cast shadow from the slits appearing or disappearing while the beam is active. A single minor flaw, such as one frame where a flash briefly overlaps a slit edge, is still acceptable at this level.
level_5: On top of that, the source, slit barrier, and screen keep identical size, shape, and position in every frame with no visible drift; the beam's progress toward and through the slits looks smooth and continuously forward-moving with no jump, pause, or unnatural burst of speed; every flash on the screen looks sharply localized and fully opaque, never overlapping the barrier or the source; and the lighting, shadows, and camera framing stay completely steady throughout, giving the impression of a rigidly mounted camera recording a real apparatus in real time.