Question about radiation pressure and law of conservation of energy?
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Suppose I have a 100% reflecting mirror in space. Light coming from one direction strikes it. Light is fully reflected. Radiation pressure accelerated the mirror. Isn't this a violation of the law of conservation of energy? In its initial state, the total energy is the rest energy of the mirror, and the energy of the light, while the final state has the rest energy of the mirror, kinetic energy and the energy of the light.
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Answer:
think conservation of momentum ... and yes, massless photons do have momentum!
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