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並前往https://www.khanacademy.org/science/physics/light-waves/introduction-to-light-waves/a/light-and-the-electromagnetic-spectrum

Light: Electromagnetic waves, the electromagnetic spectrum

Example: Calculating the wavelength of a light wave ... A particular wave of electromagnetic radiation has a frequency of 1.5 × 1 0 14 Hz 1.5\times10^{14}\text{ ...

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