tag:techtv.mit.edu,:Array/221784820 2007-12-28 10:03:37 -0500 Doc Edgerton Films Watch these flowers open and close in this time lapse film by Doc Edgerton. 123 tag:techtv.mit.edu,:Array/221763640 2007-12-27 14:37:20 -0500 Doc Edgerton Films Watch this flower move in this time lapse film by Doc Edgerton. It's a slow start, but when the sun comes up (about half way through), the plant really "wakes up". 85 tag:techtv.mit.edu,:Array/221744400 2007-12-28 10:10:07 -0500 Doc Edgerton Films Watch this single flower open and close in this time lapse film by Doc Edgerton. 54 tag:techtv.mit.edu,:Array/221725220 2007-12-05 12:37:59 -0500 Doc Edgerton Films Watch a cactus flower bloom in a time lapse video by Doc Edgerton. 22 tag:techtv.mit.edu,:Array/221697000 2007-12-28 10:06:10 -0500 Doc Edgerton Films Watch as these flowers open, close, and sway in this time lapse film by Doc Edgerton. 18 tag:techtv.mit.edu,:Array/221643780 2009-06-30 14:12:10 -0400 MIT Department of Physics Technical Services Group A wire frame is dipped in bubble solution and placed in front of a speaker. At certain frequencies, the soap film oscillates in symmetrical patterns called <a href="http://en.wikipedia.org/wiki/Normal_mode">normal modes</a>.<br><br> A light is reflected off the soap film through a lens onto the wall to show these normal modes as the frequency of the function generator is increased. The first set of normal modes occur at frequencies lower than we can hear with our ears, which is why you can't hear the speaker in the video until the frequency is increased. 268