The instability of the nucleus can be due to various causes. An uns...

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The instability of the nucleus can be due to various causes. An unstable nucleus emits radiations if possible to transform into less unstable state. Then the cause and the result can be
P
(A) a nucleus of excess nucleons is \( \alpha \) active
W.
(B) an excited nucleus of excess protons is \( \beta^{-} \)active
(C) an excited nucleus of excess protons is \( \beta^{+} \)active
(D) an nucleus of excess neutrons is \( \beta^{-} \)active
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