A radioactive element decays by beta- em...

A radioactive element decays by `beta-` emission. If mass of parent and daughter nuclide are `m_(1)` and `m_(2)` respectively, calculate energy liberated during the emission.

`[m_1-m_2-2m_e]c^2`

`[m_2-m_1-2m_e]c^2`

`[m_e - m_2-2m_1]c^2`

`[m_2-m_e-2m_1]c^2`

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