- #36
PAllen
Science Advisor
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Yes, this is insufficiently emphasized. Einstein's is one of the few derivations which make no use of any notion frequency being proportional to energy. In doing simple 'kinematic' derivations, I do take this shortcut, but Einstein did not.Sagittarius A-Star said:Unlike in most of today's derivations of the frequency-Doppler formula, he wasn't smuggling in a quantum concept in §7. He used the Lorentz-transformation for the electromagnetic field components.