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# 1 ev of energy is equivalent to

$(a)\;1.602 \times 10^{-18} J \\(b)\;1.602 \times 10^{-19} J \\ (c)\;1.602 \times 10^{-20} J \\ (d)\;1.602 \times 10^{-21} J$

1 ev of energy is equivalent to $1.602 \times 10^{-19} J$
Hence b is the correct answer.