A \( \beta^{-} \)-particle is emitted by a radioactive nucleus at t...

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A \( \beta^{-} \)-particle is emitted by a radioactive nucleus at the time of conversion of a :
\( \mathrm{P} \)
(A) Neutron into a proton
(B) Proton into a neutron
W
(C) Nucleon into energy
(D) Positron into energy
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