What is the minimum amount of energy released in the annhilation of an electron positron pair ? ...

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What is the minimum amount of energy released in the annhilation of an electron positron pair ?
Take rest mass of electron/positron
\[
=9 \cdot 11 \times 10^{-31} \mathrm{~kg}, c=3 \times 10^{8} \mathrm{~m} / \mathrm{s}
\]
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