Understanding the Energy of a Photon: A Closer Look at the Underlying Formula

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The discussion focuses on the formula E=hν, which represents the energy of a photon, and its derivation from established principles. It emphasizes that this relationship is not merely an axiom but has been empirically verified. The conversation also touches on De Broglie's equations relating momentum and wavelength, leading to the conclusion that for photons, energy can be expressed as E=pc due to their zero rest mass. The general relationship for relativistic particles is highlighted as E = √((pc)² + (mc²)²), reinforcing the connection between energy, momentum, and mass. Overall, the thread clarifies the foundational understanding of photon energy in physics.
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please look at he underligned formula. is it a axiom we have to ake for granted ?
 

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No, we can and have measured this as far as I know.
 
I think i got it
E=h.v
-De broglie : p=h/(the wace longitude:L)
hence:
E=h.c/L=p.c
 
For relativistic particles, the general relationship between energy, momentum and mass is $$E = \sqrt {(pc)^2 + (mc^2)^2}$$ where m is the invariant mass (often called the "rest mass"). For photons, m = 0 which leads to E = pc.
 
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