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The distance of light that travels in a vacuum during a time interval of 1.29.... of a second

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Is the fixed numerical value of the Planck Constat

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The duration of 9.1 x 10^7 of microwave radiation

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Is typically based on a constant called the Boltzmann Constant. Which is connected to the energy of particles moving

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Is based on how many electrons move per second

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Measure how bright a light is in a given direction