iamnogoodatthis t1_jef0egm wrote
Reply to comment by [deleted] in Technically everything we see and hear is massless, since photons and sound waves don't have any mass. by OwenIsSecretlyJesus
No you cannot. That tells you the energy content of a massive object, not that a photon has some mass thanks to its energy. The full relation is E^2 = p^2 c^2 + m^2 c^4.
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