Chemistry / Chem 0761 · Atom · ~20 seconds
Wavelength and Frequency
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A wave's wavelength is the distance between two consecutive peaks; its frequency is the number of complete cycles passing a point per second.
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A radio wave with widely spaced peaks has a long wavelength and low frequency, compared to a tightly spaced X-ray.
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Wavelength and frequency describe the same wave from two angles — neither alone tells the wave's speed.