Pitch, Loudness and the Oscilloscope Trace

Lab Brief #2

🎯 Your mission

Set it up. Test it. Be amazed.

⚡ The twist

Nature loves to surprise the careful watcher.

What you'll learn

On an oscilloscope, a higher-pitched note gives more cycles across the screen — higher frequency. A louder note gives a taller trace — greater amplitude. Pitch and loudness are independent: you can change one while holding the other steady.

Key words

pitch
How high or low a note sounds; determined by frequency.
oscilloscope
An instrument that displays how a signal's voltage varies with time.

Make a hypothesis first

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

Say your guess out loud — then find out if you were right.

Get ready

🧰 What you need

signal generator
speaker
oscilloscope or phone app

⚠️ Safety first

Keep the volume low — sustained loud tones damage hearing.

Step 1 of 4 · Read

Think about what you just learned: say what "pitch" and "oscilloscope" mean in your own words before you start.

Step 2 of 4 · Do

Feed a signal generator into a speaker and an oscilloscope. Change frequency at fixed volume and sketch the trace; then change volume at fixed frequency and sketch again. Label which control altered which feature.

Step 3 of 4 · Observe

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

Step 4 of 4 · Record

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

Question 1 of 2

A louder sound on an oscilloscope shows a trace with greater:

How sure are you?😐 maybe

Question 2 of 2

Raising the pitch of a note increases its:

How sure are you?😐 maybe

Mind = blown

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

Nice work!

You got 0 of 2 right.

Next: The Speed of Sound in Different Media All lessons

🎯

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✨ More to explore

🌍 Where you see this in real life: This shows up in your everyday life more than you'd think.

🏆 Stretch challenge (try it 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?”

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Pitch, Loudness and the Oscilloscope Trace

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