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Questions  >>  CBSE XII  >>  Physics  >>  Atoms
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The mass of a H- atom is less than the sum of the mass of a proton and electron , why is this ?

$\begin{array}{1 1} \text{Mass of a H-atom }= m_p+m_e+B/c^2 \\\text{Mass of a H-atom }= m_p-m_e-B/c^2 \\ \text{Mass of a H-atom }= m_p-m_e+B/c^2 \\ \text{Mass of a H-atom }= m_p+m_e-B/c^2 \end{array} $

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