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How does a photon gain momentum?

  1. Aug 25, 2011 #1
    If a photon has no mass, why does it have momentum? How is it calculated?
     
  2. jcsd
  3. Aug 25, 2011 #2

    ZapperZ

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    Please start by reading the FAQ sub-forum in the Relativity forum.

    Zz.
     
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