1. Mar 3, 2010 #1

   aloshi

   

   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?

    

   aloshi, Mar 3, 2010
2. 
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3. Mar 3, 2010 #2

   tiny-tim

   

   Science Advisor

   Homework Helper

   Hi aloshi!
   
   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.

    

   tiny-tim, Mar 3, 2010

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