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Is the speed of light in empty space constant?

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Most experiments to measure the speed of light in empty space lead to the same value, c. This is in agreement with the solutions to the wave equation which can be derived from Maxwell's equations. It is this apparent overwhelming evidence which lead Einstein to postulate that the speed of light is always c in empty space and to base the theory of special relativity on this postulate. This paper shows that the experimentally verified laws of electromagnetism do not restrict the speed of light in empty space to the value c. It also points out that the speed of light has been found experimentally to be constant only in the inertial frame of the measuring apparatus.
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Keywords: Maxwell's Equations; Photon; Special Relativity; Speed of Light

Document Type: Research Article

Publication date: 08 June 2013

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  • Physics Essays has been established as an international journal dedicated to theoretical and experimental aspects of fundamental problems in Physics and, generally, to the advancement of basic knowledge of Physics. The Journal's mandate is to publish rigorous and methodological examinations of past, current, and advanced concepts, methods and results in physics research. Physics Essays dedicates itself to the publication of stimulating exploratory, and original papers in a variety of physics disciplines, such as spectroscopy, quantum mechanics, particle physics, electromagnetic theory, astrophysics, space physics, mathematical methods in physics, plasma physics, philosophical aspects of physics, chemical physics, and relativity.
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