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E =mc2. e = hf is it different? - Physics Forums as Emilyjoint is saying, if we take 'm' to be the 'relativistic mass', then e =mc2 and e = hf are both correct for a photon But as Drakkith is saying, if we take 'm' to be the 'rest mass', then the full equation is E2=M2C4+P2C2 and for a photon, the rest mass is zero, so E=PC for a photon
Why is E=mc² Defined with c Squared? - Physics Forums Hi everyone, I'm not a physicist, so please excuse my ignorance In E=mc2, why is c squared? And why is the value exactly to the power of 2? Why not 2 1, or 2 438? I looked at a few other threads on this forum about this equation, but couldn't find anything addressing this aspect of it Thanks
The Mystery of c^2 in Einsteins Famous Formula E=mc^2 Explained You are seriously confused about what these formulas mean As has already been said, [itex]E = mc^2[ itex] is the amount of energy in an object of mass m in its rest frame, it is NOT "the energy of a mass m moving at maximum speed" i e , it is the object's internal energy due to the fact that it has mass The [itex]c^2[ itex] is the conversion
E=MC^2 - easy explanation for kids - Physics Forums Search "E=MC2 for kids" on youtube and you get mostly inscrutable whiteboard equations way too complex for kids Americans are behind in science because scientists are horrible teachers School teachers like me don't even understand what we are teaching
Relationship between E=mc^2 and gravity - Physics Forums By embedding space-time rather than space, it shows how one can get the right results for gravitational time dilation, etc, by drawing space-time diagrams on an ordinary 2-d manifold visualized as the surface of a 3-d object It describes the space-time geometry around a single massive object, i e the Schwarzschild geometry
E = MC2 - how was it initially proven? - Physics Forums Since light has energy E = hf and momentum E c (= hf c), when a photon leaves m1, m1 recoils with momentum E c When the photon is stopped by m2, m2 takes on momentum E c = mv (so v=E cm) In time t=2d c, m1 moves distance s=vt = E2d mc^2 At time t after m1 begins moving, m2 receives momentum E c Now you can see where there is a problem
E = mc2 is not really true in all cases? - Physics Forums This assumption can lead a person to make statements which are very serious errors E g people will almost always believe that mass density is identical to energy density It is not Rindler explains this in his 1982 intro to SR book " So please explain, E = mc2 is not really true in all cases, in which cases this doesn't hold true
Why c2 (speed of light squared)? - Physics Forums According to E=mc2, c2 tells us how much energy is retained in a unit of mass But why is this c2 and not c or c3? Besides (to me unfulfilling) mathematical explanations, C-squared makes sense to me after watching 'the car example' in this popular video: