Chemistry / Chem 0767 · Atom · ~20 seconds
The Speed of Light as a Defining Constant
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The speed of light in a vacuum is a fixed defining constant, exactly 299,792,458 meters per second by international definition of the meter.
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For any electromagnetic wave, multiplying its wavelength by its frequency always returns this same fixed speed, c = λν.
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This speed is fixed by definition, not a measured value some future experiment could revise, unlike an ordinary physical property.