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This engaging 250-word reading passage introduces fourth-grade students to the foundational concept of signals as described in NGSS standard 4-PS4-3 and Disciplinary Core Idea PS4.C. Students discover that a signal is a pattern used to send messages through light, sound, or other waves. The passage uses relatable examples like traffic lights, sirens, phone notifications, and Morse code to help students recognize signals in their everyday lives. Written at an appropriate Grade 4 reading level, the passage includes bolded vocabulary terms with immediate definitions and concrete analogies. The content builds foundational understanding without overwhelming students with complex details, preparing them for hands-on investigations and classroom discussions. Audio integration supports diverse learners by providing text-to-speech functionality, making the content accessible to all students. Accompanying activities include multiple-choice comprehension questions, writing prompts, and graphic organizers that reinforce key concepts about how signals work and why they matter in communication and safety.
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A signal is a pattern that sends a message from one place to another. Signals use light, sound, or other waves to carry information. Waves are movements of energy that travel through space or materials. Signals help people and machines communicate quickly and clearly.
We see and hear signals every day. A traffic light uses colored light as a signal. Red means stop, yellow means slow down, and green means go. The pattern of colors tells drivers what to do. A siren on an ambulance uses loud sound as a signal. The repeating sound pattern warns people to move out of the way. Your phone uses light and sound signals too. A beep or flash tells you someone sent a message.
Signals work because they follow patterns that people agree on. Think of signals like a secret code everyone knows. When you see a red light, you know exactly what it means because everyone learned the same pattern. Long ago, people used signals like smoke patterns or drum beats to send messages across distances. Today, we use digital signals in computers and phones. Digital signals are patterns of electrical energy that carry information as numbers.
Signals are important because they let us share information without being in the same place. They keep us safe, help us communicate, and make modern technology work.
What does a signal do?
Sends a message using patternsMakes things move fasterCreates new colorsStops all sounds
What does red mean on traffic lights?
Go fasterStopTurn leftHonk horn
What carries information in a signal?
Paper and pencilsCars and trucksLight, sound, or wavesBooks and magazines
Why does an ambulance siren work?
It makes a pretty soundIt uses a loud pattern people recognizeIt turns on the lightsIt stops the traffic
How did people send signals long ago?
With phones and computersWith emails and textsWith smoke patterns and drum beatsWith cars and trains
Why do signals need patterns everyone knows?
So people understand the same messageTo make them look prettyTo use less energyTo make them louder
Signals only use light to send messages.
TrueFalse
What are digital signals?
Patterns of electrical energy carrying informationColored lights on buildingsLoud sounds from sirensSmoke from fires
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