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Re: Does Light Have Weight?

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Posted by stenberg on February 1, 2000 06:27:44 UTC

: : : I believe this can be clarified by considering the notion of momentum. Photons do have momentum which adhere to the laws of space-time (and hence gravity or : : the "space-time warp"). Photons do have a rest mass (I think as prescribed by E=mc^2 -- please correct me if I am wrong) however, light does not have a true : : mass.

: Allow me to correct myself. I believe that Photons do not have a rest mass -- they do have momentum. A photon will have energy E and that will translate into : momentum by the formula

: E^2 = m^2c^4 + p^2c^2

: where p is the momentum and m (=0 for photons) is the rest mass.

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