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What is the unit of energy in atomic and...

What is the unit of energy in atomic and nuclear physics?Define it.

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Electron volt (eV) is the unit of energy in atomic and nuclear physics.
1 eV (electron volt):When I electron is accelerated under potential difference of 1 volt energy acquired by it is called electron volt.
`therefore1eV=1.602xx10^(-19)` J and 1J=`6.242xx10^(18)`eV
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