Your weekly science Geek video, thanks to Rachel Maddow's blog. [View all]
Your weekly science Geek video, thanks to Rachel Maddow.
Amazing Resonance Experiment!
Rachel's blog describes this experiment as follows:
his amazing video comes from the same guy who brought you the zig zag water video who clearly likes to illustrate the effects of sound with different media. This time around it's sand. Based on work originally done by Robert Hooke and Ernst Chladni in the 17th and 18th centuries, the video demonstrates the modes of vibration in a metal plate atop a tone generator. When the frequency of the tone generator equals a resonant frequency of the metal plate, the sand covering the plate is forced into patterns along the nodal lines (areas of zero vibration) between regions of the plate that are vibrating in opposite directions. At low resonant frequencies, there are only a few areas vibrating like this, but as the frequency increases, smaller and smaller areas on the plate start vibrating opposite to each other, creating more and more complex patterns. There is another version of this video where you can hear the tone actually being generated to make each pattern, but it comes with serious volume warning as the pitch goes high enough to cause hearing damage.
http://maddowblog.msnbc.com/_news/2013/06/16/18986378-week-in-geek-resonance-edition?threadId=3747573&commentId=76921177#c76921177
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