How to break a wine glass with sound
- Published on Mar 17, 2008
- This is for a physics project. Here's a little more detail on the steps:
Step 1: the program we used took the audio sample and used a Fourier Transform to convert it into a graph of the frequencies up to ~11,000 Hz, and their relative magnitude. The glass used in step 1 broke around 630.4 Hz, but the footage was bad so for step 3 a different glass was used, that had a resonance frequency of around 592 Hz.
Step 2: if you're around (+/- .5 Hz) the resonance frequency of the glass and if the amplitude of the sound (AKA volume) is loud enough (we used earplugs), you'll see the rim of the glass waving like that.
Step 3: we basically repeated step 2, except with a higher amplitude of the sound.
I should also mention that the bright light you see in the video is a strobe light, going at about 590-600 flashes per second (4 Hz higher than the sound), each flash lasts 10 microseconds. You can't see the movement of the glass without some sort of strobe light or way of slowing down the movement, because the glass was oscillating nearly 600 times per second. If you have any questions feel free to post them and I'll answer.
- Science & Technology