波长
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定义
周期波两个连续相同点（如波峰）之间的距离，通常以米或纳米为单位测量。
解释
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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