Mon Prof Augmenté
Vibrating Air
Age 11 · Physics
When an object vibrates, it pushes and pulls the air around it. The number of vibrations each second, measured in hertz, decides whether a note sounds low or high.
This picture is part of the full library
Every lesson is open to everyone for 7 days after it is published. This one came out on September 30, 2026: its text stays readable here, and its picture opens with a subscription.
The app is free. A subscription opens every lesson, in every school year.
Age 11: open this week
Browse Age 11
In the picture
- Drum skin: a tight surface that moves up and down after a strike
- Air ring: a layer of air squeezed and spread by the moving drum
- Left screen line: three widely spaced peaks
- Right screen line: five tightly packed peaks
Examples
- A guitar string vibrates slowly for a low note and quickly for a high note.
- A mosquito’s wings vibrate very fast, making a high buzzing sound.
Key takeaways
- Sound moves through the air as vibrations.
- More hertz means a higher note, and fewer hertz means a lower note.
Quiz: Vibrating Air (Age 11)
-
What does sound move through the air as?
-
If a note has more hertz, how does it sound?
-
What does the number of vibrations each second decide?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
Free app, optional subscription
App Store Google Play
Carry on in the app
At least one new illustrated lesson every weekday for your child’s year, with its quiz and a reminder at 6:15 pm.
Your child’s teacher does not use My Enhanced Teacher yet?
Tell them about it
