Physics · KS3 Y9 · Waves (Light & Sound)

Seeing colour: filters and surfaces

Seeing colour: filters and surfacesFree1:34Heddy Score 3 of 7, below the standard
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What you need to know

  • A surface appears a particular colour because it reflects some visible wavelengths and absorbs others.
  • An object that absorbs nearly all visible light appears black; one that reflects all colours appears the colour of its illumination.

In this clip

Runs 1:34, from 0:09 to 1:43 of the full video.

Heddy Score3/7, Below the standard
See the seven stars
  • Trusted source · passed. The creator's own upload, live and playable here.
  • On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
  • Spec-true · not judged yet. Accurate, and right for the current UK specification.
  • Focused · passed. One idea, short enough to watch in one go.
  • Accessible · passed. Good captions, clear sound and pictures.
  • Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
  • Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.
★ passed · ☆ pending · ✕ failed
Our students

Not enough students yet

Our own students' answers. These are what move ★7 Proven.
On YouTube

351K views · 5.38K likes · Professor Dave Explains 4.49M subscribers

As reported by YouTube on 2026-11-02. Not part of the Heddy Score.
How the Heddy Score works

Why we picked it

Explains colour through reflection and absorption, then shows how refraction separates white light.

Professor Dave Explains on YouTubechecked 2026-10-20

Plays from youtube-nocookie.com. No YouTube cookies until you press play.