D-first · Toy aquarium movement cardsYear 2 Science · T1 W9–10 · Sources / D first

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D-first · original supplied fiction; any reference fact/model explicitly labelled

Original fictional toy-aquarium display. A paper-strip drawing has four selected positions: centre, right, centre, left. Caption: movement model, no time or sound measurement. Helper note: a slowly moved cloth strip was seen moving; no receiver effect or sound report was recorded. Referenced general fact cardF2 (NIH/NIDCD, How Do We Hear?, last updated16March2022): incoming sound waves make the eardrum vibrate. Job: explain what our model shows and what an actual receiver investigation would still need. No real eardrum or speaker experiment occurred here.

Four exact questions

1. What does the four-position model show, and what does it not measure?
2. Separate the referenced general receiver fact from the helper’s supplied strip note.
3. For the stated explanation job, give one useful source-qualified message.
4. With guidance, ask a further receiver question whose real result is still open.