E = mc2  [ENDORSED]

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E = mc2

Postby GevickSafarians_14B » Wed Oct 05, 2016 5:07 pm

If E = mc2 is the energy of a photon, shouldn't wee need the mass of a photon to calculate this? This means photons have a mass, but only when they are moving and producing kinetic energy? But, they have no rest mass?

Cliff Danza 3F
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Re: E = mc2  [ENDORSED]

Postby Cliff Danza 3F » Wed Oct 05, 2016 8:23 pm

E=mc^2 is a formula used for matter. Photons do not have a mass, so the equation to calculate their energy is: E=(h*c)/lambda.

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