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Thread: E=mc2

  1. #1 E=mc2 
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    Jul 2014

    Please comment on the following statement:

    "As photon is in light, it has the highest velocity and according to
    law of conservation of energy, the relativistic mass is reducing towards zero [not exactly zero] to conserve the energy"

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  3. #2  
    Bullshit Intolerant PhDemon's Avatar
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    Feb 2013
    Newcastle-upon-Tyne, UK
    It is pretty much gibberish. Photons have no rest mass so the use of E=mc2 in the thread title doesn't work, you have to use the full form of the equation which is:

    E2=(mc2)2 + (pc)2

    where p is momentum which photons do​ have.

    For photons, m=0 and E=pc...

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