How to break a wine glass with sound - better version!

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The previous version wasn't the final version of the vid. This video is the version that I showed to people the day of the science fair.
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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.

Category:

Science & Technology

Tags:

• physics
• break
• glass
• resonance
• frequency
• this
• walks
• into
• wooden
• enclosure

[jahsinchu]

i would love to know the resonance freq of the human body. it must be between 8hz & 70hz( the fact that US power is run in the 60hz range is extremely interesting). but how would ya prove this without causing cellular damage?also with the glass....how could you determine the harmonic freqs?? im thinking that if using more harmonic freqz.. you could use less dB. imagine playing with haarp with the help of the techs for one day,madness!! thank ya tesla, hahahahaa

[nightmyst999]

I doubt finding the resonance of the human body is an easy task. IIRC, each person has a different resonance frequency due to changes in size and composition, and any sound that you try bouncing through the body is going to be absorbed a lot by muscles and skin.

The harmonic frequencies showed up on the forier transform just like the actual resonance frequency, but the peaks were lower in intensity.

[LargeSingingMoose]

Do you need a strobe light with a very high frequency? If so where did you get one? Cheers

[nightmyst999]

I bought a few LED flashlights and wired them to one of the computer speakers. I forget which was which, but the right and left audio channels were off by a few hertz. One channel went to the flashlight, the other went to the speaker.

[gazzounet]

Hi.

You seem to use a compression driver when you shatter the glass. But is it an industrial one, or just a wooden board with a hole ?

I've worked on this experiment for months so I really need an answer.

Thanks

[nightmyst999]

I'm pretty sure it was an industrial one. It was just tightly screwed into the hole so that the pressure would be directed solely on the glass.

[notegance]

What program did you use to analyze the frequencies AND produce the graph?

[DragonxxxFire]

Will this break my glass IRL?

[Blutarsky90]

Hey,nice video!Is it possible to set the frequency of the strobe light?If you adjust the frequency of the strobe until it has exactly the same frequency of the driving wave,you could see the glass deforming but not oscillating,and it would be awesome!By the way,which speaker did you use??I never managed to break anything with mine..

[BroadwayTheatreGurl]

Your video is very interesting. I am doing something like this for a project in Science fair, and I would like to know, what program did you use to detect and play back the frequency? And where did you get it? That would be very helpful thank you.

[MrNasirsmith]

ORRRR U CAN USE A SUBWOOFER

[iFawkChu]

OMFG MY WINDOW BROKE O.o

[ppphilippos]

@nightmyst999

I heard that loud low-piched sounds can lead to a heart attack from resonance. ANW in the video the second time the sound seems to be lower pitched than with higher volume.

[lost4468yt]

@josh1492 Clearly you know nothing about cancer or people.

[josh1492]

@jahsinchu I think you develop cancer when you resonate with something unnatural like an electrical line. I think you resonate with people when you empathize or relate to them...its more complex than a singular frequency.

[mickybond]

PHYSICS Rocks!