Lesson 7 of 8 · Waves

Experiment⭐ 30 XP

Loud and Quiet, High and Low

🧪Lab Brief #7

Loud and Quiet, High and Low.

🎯 Your mission

Predict it first. Then prove yourself right (or wrong).

⚡ The twist

Nature loves to surprise the careful watcher.

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Mind = Blown

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

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Make a hypothesis first

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

What You'll Learn

How hard something vibrates sets how loud the sound is; how fast it vibrates sets how high it is. A short, tight string vibrates quickly and sounds high, which is why the thin strings on a guitar are the high ones.

Key Words

Tap a word to see its definition.

Materials Needed

open box
elastic bands of different thickness
ruler

Safety First

Elastic bands can snap back — wear eye protection and do not overstretch them.

Steps

Step 1 — Read

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

Step 2 — Do

Stretch elastic bands of different thickness over an open box and pluck each. Sort them by pitch, then pluck one gently and hard and describe which property changed each time.

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

A faster vibration makes a sound that is:

How sure are you going to be?😐 maybe

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Where you see this in real life

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

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Stretch Challenge

Try this in real life this week.

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

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For the dinner table

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

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Next Smart Experiment

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

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Share this experiment

Send it to a parent who's looking for a 10-minute kitchen science win.

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