Signals with Light and Sound

Sirens, flashing lights, and alarms warn people far away.

Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.

What children learn in Level 41

In an emergency, people need to know fast, even from far away. Signals use light or sound to warn them.
Sound signals: a smoke alarm beeps, a tornado siren wails, and a whistle shrieks. You hear them even around a corner or with your eyes closed.
Light signals: a lighthouse warns ships about rocks, and flashing lights can be seen far away, even in a noisy place.
Some signals use both! Fire trucks and ambulances have loud sirens and flashing lights.

Georgia Standards of Excellence in Science:

S1P1.e — Design a signal that can serve as an emergency alert using light and/or sound to communicate over a distance.