High school physics education issues as seen by some American teachers: From content standards to critical thinking
Sonar Ruler Demo from cc laan on Vimeo.
I'm not sure if the accuracy and/or number of significant figures is enough for me "77 inches, well that's pretty close" as he moves his hand sideways...
Fair enough. I like it as a demonstration of the principle. It's not a gem of precision. And accuracy is limited by the temperature match, etc. I've never used the commercially available ones (which, of course, cost >$1).I still say it's very groovy!
I that a Sonic Ruler on your iPhone or are you just glad to see me?I like the COOLness - needs another iteration or two before I shell out a hard-earned buck (5.5 minutes of work at the Apple Store) for the thing.I'll consider buying it when it can track a dragon fly flittering through the night sky.
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