Amazing Water & Sound Experiment
- Thread starter Rajiv
- Start date
Wonderful! Reminds me of the core concepts of Indian philosophy - of how sound manifests all primordial vibrations and bring about a myriad of physical phenomena. Vibrations are the heartbeat of the cosmos. What we are seeing is an example of a tangible outer manifestation of these vibrations.
This wonderful video reinforces very strongly in me the idea of how music can harmonise the subtle mind body energy complex and also reminds me of the importance of Aum chanting. Think I will start today. :clapping:
AUM
--G0bble
This wonderful video reinforces very strongly in me the idea of how music can harmonise the subtle mind body energy complex and also reminds me of the importance of Aum chanting. Think I will start today. :clapping:
AUM
--G0bble
viren bakhshi
Well-Known Member
Hello Rajiv,
That was fascinating. Another example of the fertile mind and imagination of DIYers. You know, its this ability of some people to find links in seemingly unrelated phenomena that leads to real inventiveness.
Viren
That was fascinating. Another example of the fertile mind and imagination of DIYers. You know, its this ability of some people to find links in seemingly unrelated phenomena that leads to real inventiveness.
Viren
just4kix
Well-Known Member
Very fascinating, and amazing, especially the 23 Hz reverse effect.
angynagpal
New Member
Thad E Ginathom
Well-Known Member
The reverse effect is particularly good where the stream has broken up near the ground, and the droplets appear to be rising 
But, speaker + water; electricity + water... what could possibly go wrong! Happy to see the video, but I'm not going to try it!
But, speaker + water; electricity + water... what could possibly go wrong! Happy to see the video, but I'm not going to try it!
sub
New Member
As the caption goes really Amazing.
Thad E Ginathom
Well-Known Member
Amounts to the same thing, doesn't it?
Decrease in frequency would only result in slower vibration of the hose resulting in increase in the width of the water wave. Water going up is pure trickery.The reverse effect is particularly good where the stream has broken up near the ground, and the droplets appear to be rising
Evidently it would be due to the driver excursion.
Thad E Ginathom
Well-Known Member
I think the illusion is similar to the wagon wheels going backwards thing in the movies: something to do with the interaction of actual movement and shutter speed.
greenhorn
Well-Known Member
For those who know their signal processing, This is a demonstration of aliasing right ?
Yes it remains to be seen if the same effect is perceived off camera. Maybe someone can confirm by repeating the experiment with the hose directly above the amp
--G0bble
Hose pulsating
(i) due to the air movement of the woofer and
(ii) due to physical movement of driver excursions (when they are touching)
are different I guess.
Exactly. So what sound has actually got to do in this experiment is not clear to me. The hose is vibrating not actually due to sound waves, but due to mechanical movements of the attached driver at a frequency. This might be possible to achieve with any vibrator operating at that frequency not just with speaker.
Fully agree with you esp the highlighted part.
That's why 26 FPS camera was enough for this experiment. It would be interesting to see how water reacts when sound 'waves' are hitting it. It would certainly need a high speed camera.
Meanwhile, if you want to see how light moves inside water, take a look at this video.
Femto Photography - Light
BTW, the speed of the camera used is just about a trillion frames per second.
Meanwhile, if you want to see how light moves inside water, take a look at this video.
Femto Photography - Light
BTW, the speed of the camera used is just about a trillion frames per second.
greenhorn
Well-Known Member
for people trying to figure out what is happening (based on my limited understanding of Signal processing)
http://en.wikipedia.org/wiki/Aliasing
When you have a 23 or 25 hz waveform being sampled at 24 hz, you will see a 1 hz wave.
That is what you are seeing here. The stream is vibrating at 23/24/25 hz, but because of aliasing due to the sampling at 25 hz, it appears to be a 1Hz wave - yes, this is essentially the same reason why the wheels spin backwards on video
http://en.wikipedia.org/wiki/Aliasing
When you have a 23 or 25 hz waveform being sampled at 24 hz, you will see a 1 hz wave.
That is what you are seeing here. The stream is vibrating at 23/24/25 hz, but because of aliasing due to the sampling at 25 hz, it appears to be a 1Hz wave - yes, this is essentially the same reason why the wheels spin backwards on video
Thad E Ginathom
Well-Known Member
That makes sense.
Speaker vibrates: water moves: you see waveform.
...So it is waves, produced by speaker. Whether they are reaching our ear as sound is not actually relevant.
We are talking about mechanical stuff happening at a given frequency, and it is the same whether the mechanical stuff is transferred to air as sound, or to water. In fact, of course sound travels through water too, so maybe of one stuck the hose in one's ear?
hyeah:
Speaker vibrates: air moves: you hear sound.
Speaker vibrates: water moves: you see waveform.
...So it is waves, produced by speaker. Whether they are reaching our ear as sound is not actually relevant.
We are talking about mechanical stuff happening at a given frequency, and it is the same whether the mechanical stuff is transferred to air as sound, or to water. In fact, of course sound travels through water too, so maybe of one stuck the hose in one's ear?
hyeah: Wharfedale Linton Heritage Speakers in Red Mahogany finish at a Special Offer Price. BUY now before the price increase.
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