# 3D sound wave model

**URL:** <https://scienceactivitycentreiiserpune.discourse.group/t/3d-sound-wave-model/93>\
**Category:** NSD2026\
**Created:** [February 18, 2026, 1:38am UTC](https://scienceactivitycentreiiserpune.discourse.group/t/3d-sound-wave-model/93 "2026-02-18T01:38:35Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ayushkumar](https://avatars.discourse-cdn.com/v4/letter/a/bcef8e/32.png) [@ayushkumar](https://scienceactivitycentreiiserpune.discourse.group/u/ayushkumar)\
**Post date:** [February 18, 2026, 1:38am UTC](https://scienceactivitycentreiiserpune.discourse.group/t/3d-sound-wave-model/93/1 "2026-02-18T01:38:35Z")

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**NAME** : Ayush K. Sah

**SCHOOL** : Jai Hind High School, Pimpri, Pune

**PROJECT TITLE** : 3D sound wave model

DESCRIPTION : This is a 3D sound wave model where we have placed a balloon over a speaker. A small mirror is attached to the balloon, which we use to reflect a laser light. When we speak or play sound, the balloon vibrates, causing the mirror to move and create a visual pattern with the reflected laser light.

 ![3D sound wave model](https://canada1.discourse-cdn.com/flex029/uploads/scienceactivitycentreiiserpune/original/1X/fe6ef961aa59979035cdfeac1b0f662b94b8903f.jpeg)

The sound from the speaker makes the balloon stretch and shake.

Because the mirror is glued to the balloon, it moves along with the vibrations.

We aim a laser at the mirror so the light bounces off onto a wall.

When you talk, the shaking mirror makes the laser dot dance around.

Different sounds create different shapes and wiggly lines on the wall.

It is a simple way to show that sound is actually made of physical vibrations.