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electromagnetic radiation - Is there any difference in the colour of a 620 nm light and a 621 nm wavelength light? - Physics Stack Exchange
colour - The visible spectrum | Britannica
optics - Is light spectrum "exactly" measured or are descriptions of light frequencies "approximative"? - Physics Stack Exchange
All You Need to Know About Light Spectrum – Urban Ag News
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IMD simulations with f = 1.0, 600-nm light on Mo for various Be... | Download Scientific Diagram
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Electronic Structure
