PetriPulkkinen on Nostr: Sorry to butt in, but I think what iefan means is that the formula is ...
Sorry to butt in, but I think what iefan means is that the formula is E²=(mc²)²+(pc)².
E=mc² is only a special case of that: when an object is not moving relative to you and it has mass.
Light has no mass. And that’s why the special case for that is E=pc.
So no, E=mc² doesn’t always hold true. Unfortunately physicists have failed to explain that clearly to us laypeople. Alas, much lamenting among them about this confusion…
Published at
2023-05-06 00:51:14Event JSON
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"content": "Sorry to butt in, but I think what iefan means is that the formula is E²=(mc²)²+(pc)².\n\nE=mc² is only a special case of that: when an object is not moving relative to you and it has mass.\n\nLight has no mass. And that’s why the special case for that is E=pc.\n\nSo no, E=mc² doesn’t always hold true. Unfortunately physicists have failed to explain that clearly to us laypeople. Alas, much lamenting among them about this confusion…",
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