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This thought experiment proposed by Albert Einstein in 1906 considers a box of mass ... and length ... in which a quantity of radiant energy ... is emitted from one end toward the other. The box moves a distance ... (exaggerated in the picture) in a time ... with a velocity ... in the opposite direction to the photons, which carry the equivalent of a mass ... . The momentum carried by the radiation is given by ... . Assuming conservation of momentum and energy (for the case ... ) leads to Einstein's celebrated equation ... , applicable, at least, to photons.
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