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posted by Charlie Thursday, April 12, 2012 at 9:08am.
An EM wave has a wavelength of 620 nm. What is its frequency? How would we classify it?
620 nm = 620*10^-9 m. = 6.2*10^-7 m. L = V/F. F = V/L = 3*10^8m/s / 6.2*10^-7m = 4.839*10^14 cycles/s = 4.839*10^14 Hz.
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