Quote:
Originally posted by 12clicks
how heavy is a light particle?
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Depends on how you define "heavy" and/or "mass".
It has relativistic mass like this:
E = mc^2
m = E/c^2
You can get into contradictory definitions of these things really quickly because what we are talking about is models and measurements performed in particular ways (i.e. wave/particle duality is a good example).