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Science · Grade 1 Science

Chapter 1: Light and What We See

Sending a Signal with Light

Use light on purpose to tell somebody something.

Lesson
4
Time
About 10 minutes
Practice
Constructing explanations
Crosscutting concept
Patterns
Core idea
PS4.C: Information Technologies and Instrumentation

Leo's Night Message

It is night. Ben's tent is far across the field.

How can Leo send Ben a message?

Page 1

Make your guess to turn the page.

Still to come: 6 pages · Words to Know · What We Learned · 4 questions · Ask and Wonder

For the grown-up

The idea this lesson is working on — Children often think the way to reach somebody far away is to be louder. In the book Leo’s shout fades long before Ben’s tent, and his flashlight reaches it at once. Ask: why could Ben see the light but not hear the shout?

Both people must know the code — A flashing light only means something if the person watching knows what it means. One flash for yes and two for no works because Leo and Ben agreed it first. Red meaning stop works for the same reason: everybody was taught it.