ANSWERS: 2
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Look at this: http://www.glenbrook.k12.il.us/GBSSCI/PHYS/CLASS/waves/u10l2e.html
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Nanometers = 10^-9 meters. Red light, for example, has a wavelength around 650 nm. An older unit is the Angstrom, which is 1/10 of a nanometer. In the example above, the wavelength would be 6500 Angstroms.
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