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Basic photon question

  1. Apr 28, 2007 #1
    Please be gentle to a newbie question, and to my limited understanding of the subject.

    E=Mc2 as I understand it means that there is an equivalency between Mass and Energy, that essentially, mass is energy, and so the more energy of one kind or another there is, the more mass there is.

    In that case, since we know there are several kinds of energy in photons, how can they have no mass?

  2. jcsd
  3. Apr 28, 2007 #2
  4. Apr 28, 2007 #3
    Thanks. I think I got it.

    All My Best,
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