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Do photons have mass?

  1. Jun 12, 2015 #1
    I read the FAQ about photons not having mass: Do photons have mass?

    But De-Broglie's equation says that wavelength=Plank constant / mass x velocity
    i.e.
    λ=h/mv

    inserting values in the above relation we find the mass of a photon having certain wavelength
     
    Last edited by a moderator: Jun 14, 2015
  2. jcsd
  3. Jun 12, 2015 #2

    ChrisVer

    User Avatar
    Gold Member

    You wrote the debroglie equation for a massive particle (where you can write its momentum as p=mv which is not correct for the photon). You should use instead [itex] \lambda= \frac{h}{p}[/itex].
     
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