coregazer Posted March 17, 2008 Share Posted March 17, 2008 i was just wondering, despite sound not being matter, what happens when two similer sounds or identical sounds hit each other? and how would this inpact the sound? Link to comment Share on other sites More sharing options...
Klaynos Posted March 17, 2008 Share Posted March 17, 2008 They interfere.... http://en.wikipedia.org/wiki/Interference What happens depends where on the wave you are when you look... http://en.wikipedia.org/wiki/Interference#Constructive_and_destructive_interference Link to comment Share on other sites More sharing options...
ecoli Posted March 17, 2008 Share Posted March 17, 2008 superposition, baby Link to comment Share on other sites More sharing options...
coregazer Posted March 17, 2008 Author Share Posted March 17, 2008 i know this is like... kind of stupid... but is there any two waveleanghs of sound could create pressure? either on an object or on each other? Link to comment Share on other sites More sharing options...
swansont Posted March 17, 2008 Share Posted March 17, 2008 Sound waves are pressure waves. Link to comment Share on other sites More sharing options...
iNow Posted March 17, 2008 Share Posted March 17, 2008 And, since sound waves are, by definition, pressure waves, the answer to coregazer's question is that any sound will create pressure on objects (and/or other sound waves). Put a song with a fair amount of bass into your player, and get a tower speaker... hold a piece of paper in front of it, play the song. You will see the paper move as if being held in the wind. Link to comment Share on other sites More sharing options...
coregazer Posted March 17, 2008 Author Share Posted March 17, 2008 oooh, cool. So... does this mean they would be able to lift an object? if so, how bigger speaker would you need/how mutch sound? Link to comment Share on other sites More sharing options...
insane_alien Posted March 17, 2008 Share Posted March 17, 2008 you do realise that sound is cyclical. in other words, half a cycle round you'll have a partial vacuum pulling the object towards the speaker again. Link to comment Share on other sites More sharing options...
coregazer Posted March 17, 2008 Author Share Posted March 17, 2008 you do realise that sound is cyclical. in other words, half a cycle round you'll have a partial vacuum pulling the object towards the speaker again. lol. sounds like a good idea for a whole new generation of trampolining XD. lol. im not that mad. dont worry. but a little more on the insane side, would a circle of inverted sound be able to hold an object in place? once more, if so, what would be required. Link to comment Share on other sites More sharing options...
garshmuda Posted March 17, 2008 Share Posted March 17, 2008 ever seen the howard stern movie 'private parts'? there's a great scene in which he uses sound pressure to, well, go see for yourself Link to comment Share on other sites More sharing options...
John Cuthber Posted March 17, 2008 Share Posted March 17, 2008 Perhaps watching this would be at least as scientific. and a not brilliant wiki article. http://en.wikipedia.org/wiki/Acoustic_levitation Link to comment Share on other sites More sharing options...
coregazer Posted March 17, 2008 Author Share Posted March 17, 2008 Perhaps watching this would be at least as scientific. and a not brilliant wiki article. http://en.wikipedia.org/wiki/Acoustic_levitation okay, so hes using ultrasonic sound to levitate droplets of water... cool, is that because he thinks it looks cool or he cant levitate anything else without amplyfying the sound tenfold?... o_O... ie. what would be required to lift... i dont know... a.... glass? Link to comment Share on other sites More sharing options...
Zephir Posted March 25, 2008 Share Posted March 25, 2008 ... what happens when two similer sounds or identical sounds hit each other? and how would this inpact the sound?.. Some trivial simulation of such situation (developed & tested just for MSIE 6.0 browser only, sorry). Link to comment Share on other sites More sharing options...
CaptainPanic Posted March 28, 2008 Share Posted March 28, 2008 There's a research about Thermo-acoustic heat pumps... these devices convert heat into acoustics (a step which I actually don't understand)... these acoustic waves (at some massive 170 dB or more) are transported through a pipe and generate a significant pressure fluctuation at the other end. Because compression and expansion of gases go together with warming up and cooling down, a temperature difference is created... result: a heat pump. About the company that is doing research: http://www.ecn.nl/en/eei/r-d-programme/industrial-heat-technology/process-heat/thermoacoustic-heat-pump/ A website which shows how it works (click "principle", and then "start"): http://www.aster-thermoacoustics.com/indexeng.html I think it's mad, and I think it's diabolically cool... and that's why I posted it. Link to comment Share on other sites More sharing options...
Klaynos Posted March 28, 2008 Share Posted March 28, 2008 It's quite a well known effect, you can supposedly cool stuff down from that as well... One of my friends did a third year project on it... Link to comment Share on other sites More sharing options...
zeig Posted April 2, 2008 Share Posted April 2, 2008 you do realise that sound is cyclical. in other words, half a cycle round you'll have a partial vacuum pulling the object towards the speaker again. even tho sound levetaion devices have been made Link to comment Share on other sites More sharing options...
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