How does light travel from its source to the eye, and why can’t we see beams of light as they move through the air? We look at how light can go through some materials, but not others, explaining transparent, opaque and translucent with the help of experiments and a quiz. How to change the size of hand shadows is dramatically demonstrated.
The sound section shows fun ways in which vibrations are made. We examine if sound can travel through different solid materials. Is it possible for a whisper to travel across the whole hall? With the help of giant straws, we demonstrate that pitch can be easily understood, plus Adrian plays two different size recorders at once!