Mass-Energy Conservation: E/m=c^2

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We know the equation E=mc^2 which correlates energy to mass.
If we rearrange the equation:
E/m = c^2 , it turns into the ratio of energy to mass is the square of the speed of light, does it mean for every particle in the universe, the ratio between the energy of the particle and its mass is the square of the speed of light?
 
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correct
 
The complete equation is ##E^2/c^2-p^2=m^2 c^2##. So the relationship you wrote holds as long as p=0, in other words for a particle at rest.
 
Does photon satisfy the full equation, because photon has momentum but does not have mass?
 
yep, the photon does satisfy the full equation.
 
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