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Track recap

Full trackRecap mode
Track recap120 min

Sound and Acoustics

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Stay on the sound branch long enough that longitudinal motion, pitch-versus-loudness cues, beats, Doppler shifts, and open-vs-closed air-column resonance feel like one acoustics path instead of isolated pages.

About recap mode

Keep the authored order, then open the extra explanation only when you need to understand how recap is choosing the next review move.

How it works

Same authored sequence, lighter revisit.

Recap mode does not invent a second curriculum. It keeps the existing starter-track order, then changes the prompt and suggested action with the current mastery and progress signals.

Keep using concept pages

Quick tests, challenge mode, worked examples, and read-next stay where they already live.

Recap links only jump you to the most useful surface for a fast review. The simulation-first concept pages still carry the real teaching work and keep the guided path intact.

Recap steps

Revisit the track in the same authored order.

Focus badges and button targets come from the current mastery and progress signals. The next ready checkpoint still stays in the loop.

  1. 1Not startedNewNext guided step

    Sound Waves and Longitudinal Motion

    Sound Waves and Longitudinal Motion is still the next guided step in this authored order. No finished quick test, solved challenge, or completion mark is saved yet.

    Start here before moving into Pitch, Frequency, and Loudness / Intensity.

    Compression and rarefactionParticle vs wave motion25 min
    Open next step
  2. 2Not startedNewAhead

    Pitch, Frequency, and Loudness / Intensity

    This concept stays in the recap because it completes the authored track story, even if you have not reached it on this browser yet.

    Builds on Sound Waves and Longitudinal Motion before setting up Beats.

    Pitch from frequencyLoudness from amplitude20 min
    Preview concept
  3. 3Not startedNewAhead

    Beats

    This concept stays in the recap because it completes the authored track story, even if you have not reached it on this browser yet.

    Builds on Pitch, Frequency, and Loudness / Intensity before setting up Doppler Effect.

    Amplitude envelopeBeat frequency20 min
    Preview concept
  4. 4Not startedNewAhead

    Doppler Effect

    This concept stays in the recap because it completes the authored track story, even if you have not reached it on this browser yet.

    Builds on Beats before setting up Resonance in Air Columns / Open and Closed Pipes.

    Compressed wavefrontsMoving observer25 min
    Preview concept