This packet is everything a parent or guide needs to assess Unit 03 at home — learning targets, the answers that count as correct, the mastery rubric, calibration examples, and a clipboard score sheet. No multiple-choice test: the student shows mastery by ordering the spectrum, splitting light with a diffraction grating, and reading the lines aloud.
By the end of the Light, Telescopes & Spectra unit, a student should be able to:
Six criteria, each judged Not yet / Approaching / Mastered (Page 3).
Light split with a diffraction grating; emission and absorption lines read.
The student reads a spectrum aloud (Page 4).
Dated spectrum sketches kept across weeks.
You are making a decision, not adding up points. For each criterion, decide whether the work is Not yet, Approaching, or Mastered — the column language tells you which. A criterion counts as mastered only when the student can both produce a spectrum and say what it reveals about composition, temperature, and motion. A student carries three tokens per term; one token buys a re-do of one criterion on another night, so a single clouded-out evening never sinks the unit.
Accept any answer in the synonyms column — they are pre-approved as equivalent. The third column flags the confusions that look close but are not yet, so you can coach precisely.
| Canonical answer | Accepted synonyms | Common confusion / discriminator |
|---|---|---|
| Light & telescopes | ||
| Electromagnetic spectrum | the light bands, radio to gamma | Ordered by wavelength and energy; visible light is one slice |
| Aperture | light-gathering diameter | Governs brightness and resolution, not magnification |
| Reflector vs refractor | mirror vs lens telescope | Both focus light; aperture matters more than the design |
| Spectra | ||
| Diffraction grating | light-splitter | Spreads light into a spectrum — finer than a prism |
| Emission line | bright line | A specific element giving off light at its own colors |
| Absorption line | dark line | Colors removed by cooler gas in front — a color gone missing |
| Spectral fingerprint | line pattern | Identifies the element; unique to each |
| Doppler shift | red / blue shift | Whole pattern shifted red = moving away, blue = moving toward us |
| Criterion | Not yet | Approaching | Mastered |
|---|---|---|---|
| The electromagnetic spectrum | Thinks visible light is all there is, or cannot order the bands. | Names a few bands but muddles their order or relative energy. | Orders the electromagnetic spectrum by wavelength and energy and explains what each band reveals about the sky. |
| Telescopes & gathering light | Thinks a telescope mainly magnifies the view. | Names refractor and reflector but cannot say why aperture matters. | Explains how aperture governs light-gathering and resolution, and contrasts refractor with reflector optics. |
| Producing a spectrum | Cannot spread light into a spectrum. | Makes a spectrum with a grating but cannot distinguish the line types. | Uses a diffraction grating to spread light and reads emission versus absorption lines. |
| What spectra reveal | Sees color but reads no information in it. | Says lines mean elements but not temperature or motion. | Reads a spectrum for composition, temperature, and line-shift motion — the Doppler effect. |
| Observation technique & the journal | Uses white light at the eyepiece or leaves the journal blank. | Observes with a grating or telescope but keeps thin, undated notes. | Works cleanly under a red flashlight, uses the grating, binoculars, and telescope well, and logs dated spectrum sketches across weeks. |
| Integration (cross-domain) | Treats the science as isolated facts. | Names a link to history, reading, or writing but cannot defend it. | Connects the unit across History · Reading · Writing and defends why it matters. |
The split between Approaching and Mastered is information over pretty: not that a grating makes a rainbow, but that the lines fingerprint an element and a shift tells you motion. Ask “what does that spectrum tell you about the star?”
Read these before you grade. They show what Mastered and Not yet actually sound like, plus the edge cases where you should coach rather than decide on the spot.
Student: ______________________________________ Date: _______________ Guide: _________________________
| # | Criterion | Decision | Notes |
|---|---|---|---|
| 1 | The electromagnetic spectrum | NY / Appr / Mast | |
| 2 | Telescopes & gathering light | NY / Appr / Mast | |
| 3 | Producing a spectrum | NY / Appr / Mast | |
| 4 | What spectra reveal | NY / Appr / Mast | |
| 5 | Observation technique & the journal | NY / Appr / Mast | |
| 6 | Integration (cross-domain) | NY / Appr / Mast |
☐ No ☐ Yes — for criterion: __________ Tokens remaining: ☐ 3 ☐ 2 ☐ 1 ☐ 0
NY = Not yet · Appr = Approaching · Mast = Mastered · Unsure between two levels? Circle the lower one and note what a re-do would need.