A nucleus of \( { }_{84}^{210} \mathrm{Po} \) originally at rest emits \( \alpha \) particle wit...

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A nucleus of \( { }_{84}^{210} \mathrm{Po} \) originally at rest emits \( \alpha \) particle with speed \( v \). What will be the recoil speed of the daughter nucleus?
(A) \( 4 v / 206 \)
(B) \( 4 y / 214 \)
(C) \( v / 206 \)
(D) \( v / 21 \)
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