Some of the physical assumptions which are implicit in the proposed new definition of the metre are discussed, including the mass of the photon and the constancy of the fine structure constant.
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Petley, B. New definition of the metre. Nature 303, 373–376 (1983). https://doi.org/10.1038/303373a0
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DOI: https://doi.org/10.1038/303373a0
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