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A radioactive element decays by beta^(-)...

A radioactive element decays by `beta^(-)` emission. If mass of parent and daughter atom are `m_(1)` and `m_(2)` respectively, calculate energy liberated during the emission. Mass of an electron = m.

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The correct Answer is:
`[(m_(1) - m_(2) - 2m)c^(2)]`
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