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Darren Altman
Cinquecento
Joined: 17 Oct 2009
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Location: London, UK
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Bruce
Boardmeister
Joined: 06 Jun 2005
Posts: 7926
Location: Portland, OR
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 Posted: Wed Mar 20, 2013 8:11 am Post subject: |
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Well he kind of lost me when he started sucking the water back up the pressurized hose with sound waves (by reversing the video).
I tend to think it's largely a hoax, but there were reports that day of elephants at the nearby zoo trumpeting, "turn down the stereo you punk kids!!!".
B
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Scott Pollak
The Gates of Troy
Joined: 01 Jun 2010
Posts: 1903
Location: Looking out at the San Juan mountains
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| Posted: Wed Mar 20, 2013 8:40 am Post subject: |
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That is... the coolest thing... I have ever seen.
Bruce, I don't think it was reversed. I think it's like when you see car wheels appearing to go backwards on the road at certain speeds. It only appeared to be going backwards.
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Jason Huggins
The Gates of Troy
Joined: 12 Aug 2011
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Location: In the souls of a million jeans
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| Posted: Wed Mar 20, 2013 8:40 am Post subject: |
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Still a cool video though  |
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Chris Ratliff
Contributor II
Joined: 15 Oct 2009
Posts: 73
Location: Somewhereinthesticks-butnottoofar-forhighspeedinternet,SC
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| Posted: Wed Mar 20, 2013 9:02 am Post subject: |
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It's all in the frame rate of the camera and the frequency coming out of the speaker. 24fps on the camera, 24hz coming from the speaker. The water "reversing" happens when the frequency is changed to 23hz.
Definitely cool!
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todd ellis
A Zillion
Joined: 02 Jan 2007
Posts: 10494
Location: little egypt
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| Posted: Wed Mar 20, 2013 9:09 am Post subject: |
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hmmmmm, had me until the reversal ... i'm bookmarking to try it this summer, though. could be a great 8th grade science project for boy #3.
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heyguido
MMD
Joined: 31 Aug 2011
Posts: 2507
Location: RDU, the Geek Capitol of the South
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| Posted: Wed Mar 20, 2013 10:03 am Post subject: |
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Chris hit it on the head. Frame rate. Video parlor trick. You wouldn't see it with your naked eye.
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Don Brookshire
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Scott Pollak
The Gates of Troy
Joined: 01 Jun 2010
Posts: 1903
Location: Looking out at the San Juan mountains
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| Posted: Wed Mar 20, 2013 11:09 am Post subject: |
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Yup, you guys are right about the frame rate:
http://www.boredpanda.com/24hz-sine-wave-water-sound-experiment-brusspup/
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Scott R. Pollak
Clients include Pandora, NPR Atlanta, Wells Fargo, Cisco, Humana, Publix, UPS, AT&T, HP, Xerox and more.
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Chris Ratliff
Contributor II
Joined: 15 Oct 2009
Posts: 73
Location: Somewhereinthesticks-butnottoofar-forhighspeedinternet,SC
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| Posted: Thu Mar 21, 2013 6:14 pm Post subject: |
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Mah mawma says I's a smart boy. 
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