{"id":57093,"date":"2025-12-11T04:47:51","date_gmt":"2025-12-10T19:47:51","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=57093"},"modified":"2025-12-11T04:47:51","modified_gmt":"2025-12-10T19:47:51","slug":"like-magic-a-budget-friendly-experiment-to-control-standing-waves-with-a-speaker-and-string","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=57093&lang=en","title":{"rendered":"Like Magic! A Budget-Friendly Experiment to Control Standing Waves with a Speaker and String"},"content":{"rendered":"

Hello, I’m Ken Kuwako, your science trainer. Every day is an experiment.<\/span><\/p>\n

Ever wondered what the shape of invisible “sound” looks like? You might picture pricey gear in a science lab, but the truth is, you can pull off surprisingly professional experiments using simple, everyday items. Today, we’re diving into the “standing wave” (teijou-ha) experiment, where a string seems to come alive and dance. Working with Mr. I from our school, we managed to build a high-performance, budget-friendly device using smart finds from a 100-yen shop. It’s a fantastic project for teachers and a perfect science fair idea for students at home.<\/p>\n

The Science Recipe: Building Your Experiment with Everyday Items<\/h3>\n

You don’t need any fancy or specialized equipment to conduct a “physics experiment.” Here are the items you’ll need. The entire setup will cost you about the price of a single lunch!<\/p>\n

What You’ll Need: A cheap speaker (you’ll be taking this apart). For instance, the 300-yen speaker we found at Daiso was quite powerful. Its 3W output allows us to shake the string more forcefully and dynamically. That’s part of the fun in science experiments\u2014finding better components and upgrading your setup!<\/p>\n

\"\"<\/p>\n

\u30fbKite string (or similar) \u30fbWeight (fishing weights or a bundle of five-yen coins work as a substitute) \u30fbCutting board rack (purchased at a 100-yen shop)<\/p>\n

\"%e3%82%b9%e3%82%af%e3%83%aa%e3%83%bc%e3%83%b3%e3%82%b7%e3%83%a7%e3%83%83%e3%83%88-2016-11-07-17-30-49\"<\/p>\n

\u30fbUSB charger\/AC adapter (purchased at a 100-yen shop)<\/p>\n

\"%e3%82%b9%e3%82%af%e3%83%aa%e3%83%bc%e3%83%b3%e3%82%b7%e3%83%a7%e3%83%83%e3%83%88-2016-11-07-17-31-08\"<\/p>\n

\u30fbA smartphone or iPad to be the sound source (Make sure to install a free “tone generator” app. Any app that can output specific frequencies will work.)<\/p>\n

Now, let’s put these items together. Tie the kite string to the vibrating cone of the speaker. Run the other end over the cutting board rack, and use the weight to keep the string perfectly taut.<\/p>\n

\"\"<\/p>\n

Time to flip the switch! When you start the vibration…<\/p>\n