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Feynman Lectures: A Photon's Weight

So on p. 2-10, Feynman says that a photon has zero mass and this means that (by nature of a particle that has no mass) it cannot be at rest. So a photon is defined as a particle that always moves at 186kmph. Amazing...

Posted by steven n fettig on August 19, 2007 9:22 PM |

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