(D) To convert energy from Joules $(J)$ to electron-volts $(eV)$,we divide the energy value by the charge of an electron,which is $1.6 \times 10^{-19}

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(D) To convert energy from Joules $(J)$ to electron-volts $(eV)$,we divide the energy value by the charge of an electron,which is $1.6 \times 10^{-19} \ C$.Given energy $E = 10^{-20} \ J$.$E \text{ (in } eV) = \frac{10^{-20} \ J}{1.6 \times 10^{-19} \ J/eV}$$E = \frac{1}{1.6} \times 10^{-1} \ eV$$E = 0.625 \times 0.1 \ eV$$E = 0.0625 \ eV$.