The evolution of lasers...

Discussion in 'Physics' started by cmartinez, Aug 1, 2016.

  1. Glenn Holland

    Active Member

    Dec 26, 2014
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    In order to create an electron/positron pair, a photon must provide a minimal energy of E=hf where h is Plank's Constant and f is the frequency of the photon.

    I believe the photon must also pass through an electric field (such as the one found around the nucleus). So without a source of a field, it is impossible to create a pair in a complete vacuum.
     
  2. nsaspook

    Expert

    Aug 27, 2009
    6,090
    6,866
    But you can create virtual particle fairies in complete vacuum.

    [​IMG]
     
  3. wayneh

    Expert

    Sep 9, 2010
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