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Radiation from antennae - a new philosophy
On 10/9/2014 9:15 PM, Jerry Stuckle wrote:
On 10/9/2014 7:04 PM, rickman wrote: On 10/9/2014 5:14 PM, Jerry Stuckle wrote: On 10/9/2014 1:04 PM, rickman wrote: The only mass a photon has is that which is equivalent to its energy, E = mc^2. I understand it has no rest math. But where does the mass come from? There has to be mass to exert pressure. Does the mass just appear from nowhere? I doubt it... When a proton is accelerated and the mass quadruples, where does that extra mass come from? It comes from the energy used in the acceleration of the proton, based on Einstein's equations. Mass and energy are just different manifestations of the same thing. So why do you have trouble understanding where the relativistic mass of a photon comes from? Is the exact same thing but without the rest mass. But by definition, anything moving at the speed of light must be massless, because it takes an infinite amount of energy to accelerate even an electron to that speed. Which means a photon cannot have mass. Yes, it has no *rest mass*. The rest mass is what limits the acceleration. You are thinking in a circle and you can't seem to get out of the loop. Rest mass vs. relativistic mass. One is present even at rest while the other is a result of the energy added as a function of its speed. -- Rick |