$1 \ eV = ...... \ J$. (Fill in the gap)
$(1.602 \times 10^{-19})$ The electron volt $(eV)$ is a unit of energy defined as the amount of kinetic energy gained by a single electron accelerating from rest through an electric potential difference of $1 \ V$.
Since the charge of an electron is $e = 1.602 \times 10^{-19} \ C$, the energy in Joules is given by $E = qV = (1.602 \times 10^{-19} \ C) \times (1 \ V) = 1.602 \times 10^{-19} \ J$.
Therefore, $1 \ eV = 1.602 \times 10^{-19} \ J$.
Since the charge of an electron is $e = 1.602 \times 10^{-19} \ C$, the energy in Joules is given by $E = qV = (1.602 \times 10^{-19} \ C) \times (1 \ V) = 1.602 \times 10^{-19} \ J$.
Therefore, $1 \ eV = 1.602 \times 10^{-19} \ J$.
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