波長
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定義
周期的な波の2つの連続する同一点（たとえば山と山）の間の距離で、通常はメートルまたはナノメートルで測定される。
解説
Visible light spans roughly 380 nm (violet) to 700 nm (red). Radio waves can have wavelengths of hundreds of meters, while X-rays measure in tenths of a nanometer. Wavelength and frequency are inversely related through wave speed: λ = v/f. In fiber optics, 1,550 nm is the standard wavelength for long-distance data transmission.
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