How to convert 13.6electron volts to joules?
So the energy in joules E(J) is equal to the energy in electron-volts E(eV) times 1.602176565⋅10-19:
E(J) = E(eV) × 1.602176565⋅10-19 13.6 eV = 13.6 x 1.602176565 x 10-19 = 21.78 x 10-19 J
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