Hi all, We all know that in relativity theory E = m c^2 and that in quantum mechanics E = h f (where f is the wave frequency), so that a mass m corresponds to a frequency f = m c^2 / h (called its Compton frequency).
However, until now it has not been practical to directly relate frequency and mass, because c^2/h is just too big. Well, in a new article http://www.sciencemag.org/content/339/6119/554.abstract researchers from Berkeley have been able to build a clock with an accuracy of E-9 that directly connects mass and frequency. Eventually this may lead to linking the definitions of the second and the kilogram. Y(J)S
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