Answer:
The rest mass of an electron or positron is \[{{\text{m}}_{0}}=\text{9}.\text{1}\times
\text{1}{{0}^{-\text{31}}}\text{kg}\].
In the annhilation of an electron positron pair, the rest mass of
the two particles is converted into energy.
Minimum energy released, \[E=2{{m}_{0}}{{c}^{2}}=2\left(
9.1\times {{10}^{-31}} \right){{\left( 3\times {{10}^{8}} \right)}^{2}}joule\]
\[\text{E }=\frac{2\times 9.1\times 9\times
{{10}^{-15}}}{1.602\times {{10}^{-13}}}MeV=1.02\,MeV\]
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