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sunroof
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If Einstein's box (http://galileo.phys.virginia.edu/classes/252/mass_and_energy.html ) is full of phonons instead of photons, the momentum is Mv=E/c' and time is t=L/c' where c' is the velocity of a phonon. The result should now be E=mc'^2 rather than E=mc^2.
E=mc^2 is tenable to photons in vacuum but invalid to phonons?
E=mc^2 is tenable to photons in vacuum but invalid to phonons?
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