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Another great idea for an intro mechanics lab.
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Includes a great lab-porn picture of the laser in action.
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"The magazine has sent out surveys to 1,600 high school counseling offices asking them to evaluate colleges, and the results may be used in next year's rankings. Or not. U.S. News isn't deciding how to use the high school data until after the results
More like this
Last week we asked our readers about where they got their news. I haven't watched local news for years, and I was wondering if anyone else in the blogosphere did.
Two dead. Then alive.
Ooh...that laser picture IS pretty. Makes me wish my lab had more lasers.
the laser beam's power is concentrated to a 1.3-micron speck about 100th the diameter of a human hair. A human hair is about 100 microns wide.
1) Give the folks a digital micrometer and have them do some measurements. Any hair 100 microns in diameter probably isn't of human origin. 60 microns is thick (round black straight coarse beard). It is also an opportunity for obtaining a fiducial RCH (ask a machine shop old fart).
2) It's not the ratio of spot diameters, it's the ratio of spot areas. Airy circles are left as an exercise for the alert reader.
Diversity: Skimming the top 10% of the bottom 10%.
We need an RSS feed devoted to lab pics, that would be just awesome. Your daily optical bench, your daily vacuum pump, etc.