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To help compare different orders of magnitude this page lists energies between 10-10 joules and 10-9 joules (620 MeV and 6200 MeV) Weaker energies 1.5 × 10-10 J (940 MeV) -- mass-energy of a proton 1.602 × 10-10 J -- 1000 MeV Stronger energies External link Conversion Calculator for Units of ENERGY (http://www.ex.ac.uk/cimt/dictunit/ccenrgy.htm)