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Grade 4 Science · World 6: Light Lab · Level 42
Signals with Light
Design a way to send a message with a flashlight or mirror and a code.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 42
- Light is fast and travels far, so people have long used it to send messages.
- A code gives each signal a meaning. Morse code uses short and long flashes for letters. Here are S and O.
- Both people must know the code, and the light needs a straight path from one to the other.
- Mirrors can signal too, by reflecting sunlight toward someone far away. Lighthouses warn ships with bright beams.
- Try it with a grown-up: invent a flashlight code. Test it across a dark yard, then improve it. Point the light at the ground near your partner, never at their eyes.
Georgia Standards of Excellence in Science:
- S4P2.b — Design and construct a device to communicate across a distance using light and/or sound.