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Please choose a defining constant:
The Unperturbed Ground State Hyperfine Transition Frequency of The Caesium-133 Atom
The Speed of Light in a Vacuum
The Luminous Efficacy of Monochromatic Radiation of Frequency 540×10
12
Hz
Planck's Constant
Elementary Charge
The Boltzmann Constant
Avogadro's Constant
