A certain radioactive nuclide of mass number \( \mathrm{m}_{\mathrm{x}} \) disintegrates, with t...

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A certain radioactive nuclide of mass number \( \mathrm{m}_{\mathrm{x}} \) disintegrates, with the emission of an electron and \( \gamma \) radiation only, to give second nuclied of mass number \( \mathrm{m}_{\mathrm{y}} \). Which one of the following equation correctly
\( \mathrm{P} \) relates \( \mathrm{m}_{\mathrm{x}} \) and \( \mathrm{m}_{\mathrm{y}} \) ?
(A) \( m_{y}=m_{x}+1 \)
(B) \( m_{y}=m_{x}-2 \)
(C) \( m_{y}=m_{x}-1 \)
(D) \( m_{y}=m_{x} \)
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