1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

How can we said that photon does not have a mass?

  1. Mar 3, 2010 #1
    how can we sad that photon does not have a mass? in my book they are a piece that there write at the photon influence of gravitation?
     
  2. jcsd
  3. Mar 3, 2010 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hi aloshi! :smile:

    Mass is energy, energy is mass.

    A photon does not have rest-mass, but it does have mass.

    A box into which photons are inserted (from outside) weighs more, and exerts more gravity.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: How can we said that photon does not have a mass?
Loading...