A radioactive nucleus of mass number \( A \), initially at rest, \(...

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A radioactive nucleus of mass number \( A \), initially at rest,
\( \mathrm{P} \) emits an \( \alpha \)-particle with a speed \( v \). What will be the recoil speed of the daughter nucleus?
W.
(A) \( \frac{2 v}{A-4} \)
(B) \( \frac{2 v}{A+4} \)
(C) \( \frac{4 v}{A-4} \)
(D) \( \frac{4 v}{A+4} \)
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