Guest guest Posted December 31, 2006 Report Share Posted December 31, 2006 Indeed, the A is Angstroms. Visible light is generally 4000 to 7000 Angstroms, which equals 400 to 700 nanometers. The Angstrom unit was in use up to maybe 30 years ago, when the International Community standardized to the metric system, and everything in this spectrum went to nanometers. The color spectrum is shown at: http://www.cedmagic.com/featured/war-worlds/color-spectrum-rca.jpg http://acept.la.asu.edu/PiN/rdg/color/spectrum.gif http://en.wikipedia.org/wiki/Visible_light and I'm sure there are better charts out there.. 620 - 750 nm = red 590 - 620 nm = orange 570 - 590 nm = yellow 495 - 570 nm = green 450 - 495 nm = blue 380 - 450 nm = violet When it comes to minerals, there are spectroscopic color charts for the minerals, but how those compare to audio frequencies is out of my area of knowledge. (For whatever its worth, most automobile car tail lights have a lot of orange in them so that they're brighter .. some of the old cars did have red taillights.. The eye really doesn't see red all that well, so they started using filter materials with more orange for a brighter light.) Dave fgdhdkvujdfrurn wrote: >the A could stand for a unit of measurment called an Angstrom. >1 Ångström (Å) = 1.0 x 10–10 metres = 0.1 nm = 100 pm >Perhaps refering to the wave lenth of the light. > > > > > > Quote Link to comment Share on other sites More sharing options...
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