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What is the SI unit of energy? How is the electron volt (eV) related to it?

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Joule is SI unit of energy 

Relation between eV and J 

1eV = charge on 1 electron x 1V 

1eV = 1.6 x 10-19 [∵ 1 Lx 1 V- 1J] 

J x 1V 

1eV = 1.6 x 10-19J

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