Lesson 8 of 8 · Waves

Experiment⭐ 30 XP

Materials That Block Sound

🧪Lab Brief #8

Materials That Block Sound.

🎯 Your mission

Run the experiment. Find out what really happens.

⚡ The twist

Nature loves to surprise the careful watcher.

🤯

Mind = Blown

🔬 The more you look, the more nature shows you.

🔮

Make a hypothesis first

Before you start: write down what you think will happen, and why.

What You'll Learn

Soft, thick and uneven materials absorb sound energy instead of reflecting it, which is why a carpeted room sounds quieter than a tiled one. Hard flat surfaces bounce sound back and make echoes.

Key Words

Tap a word to see its definition.

Materials Needed

cardboard box
phone with sound level app
speaker
cloth
foam
aluminium foil

Safety First

Keep the tone quiet — sustained loud sound damages hearing.

Steps

Step 1 — Read

Read the explanation above and note the two key terms before you start.

Step 2 — Do

Play a steady tone into a box and measure the sound level outside it with a phone app. Repeat with the box lined with cloth, then foam, then foil, and rank the four linings.

Step 3 — Observe

Record what actually happened, including anything that did not match what you expected.

Step 4 — Record

Write a conclusion that answers the question this lesson opened with, and state your uncertainty.

Check Your Understanding

Question 1

1 of 2

Which material would absorb the most sound?

How sure are you going to be?😐 maybe

🌍

Where you see this in real life

This shows up in your everyday life more than you'd think.

🏆

Stretch Challenge

Try this in real life this week.

Try one experiment in real life this week — even a tiny one.

👨‍👩‍👧

For the dinner table

“What's the most surprising thing you learned today?”

🎯

Next Smart Experiment

We'll pick an experiment that matches exactly how you're thinking right now.

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