1
How light travels
Light travels in straight lines and very fast — about 300,000 km per second.
→ → → 💡
Light & Sound
📖 Study · Light & Sound
Light & Sound
Light and sound travel — but they behave differently.
🎯 What you'll learn
- ✓Light travels in straight lines
- ✓Shadows form when light is blocked
- ✓Sound is vibration
- ✓White light has all colours
2
Shadows
When something blocks the light, you see a shadow on the other side.
💡 → 🪨 → 🌑 shadow
3
Rainbow / white light
White light is all colours mixed. A prism splits it into a rainbow.
🌈 = R O Y G B I V
4
Sound is vibration
When something vibrates, it makes the air vibrate, and we hear sound.
🥁 vibrates → 🌊 air → 👂 ear
5
Sound through stuff
Sound travels through air, water and solids — but NOT through a vacuum (space).
Air ✓ Water ✓ Wood ✓ Space ✗
6
Light vs sound
Light is much faster than sound. That's why we see lightning before hearing thunder.
⚡ first → 🌩️ then