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Define electron volt and express it in joule.

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Electron volt is defined as the amount of energy one electron gains by moving through a potential difference of one volt. Hence, one electron volt is equal to elementary charge (1.60217657 × 10-19 coulombs (C)) multiplied by one volt. It can be written as

ev = (1.60217657 × 10-19 C) (1V)

Therefore, 1ev = 1.60217657 × 10-19 J.

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