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Photons (very newbie and simple question)

  1. Apr 16, 2009 #1
    What is the width of a single photon? I read that width of average atom is 1.3e-8 cm and wanted to know width of photon. Is the reason you can't view single atom is because it is smaller than a photon and will not reflect light or opposite true?
  2. jcsd
  3. Apr 16, 2009 #2
    A photon does not have a 'width.' It is described like any other particle, as a 'point,' with no definable size. It has a definable energy, but no 'size.'

    I am anticipating your next question. What gives an atom size is the distance between the point particles inside, i.e. the electrons, and the protons. The protons and neutrons are made up of quarks, which are also point particles.
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