Crookes Radiometer Spins in Light
Vanes spin faster in bright light.
Teaching & key ideas
What you do: Move radiometer between dim and bright light.
What students see: Vanes spin faster in bright light.
Why it works: Temperature differences around vanes and gas molecules create radiometric forces.
Question to ask: Is light pushing the black side directly?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: Is light pushing the black side directly?