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Using an example from the redder end of the spectrum, he notes that a combination of red and green lights of wavelengths 640 nanometers and 540 nm, respectively, appears to our eyes as a single yellow glow of 580 nm wavelength. Uncertainties in the NIST spectral standards for detectors and sources in the visible wavelength range are propagated from the high accuracy cryogenic radiometer measurements, taking correlations into account at every stage. Electromagnetic waves are characterized by wavelength and frequency. |
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