When a \( U^{238} \) nucleus originally at rest, decays by emitting... VIDEO
When a \( U^{238} \) nucleus originally at rest, decays by emitting an alpha particle having a speed ' \( u \) ', the recoil speed of the residual nucleus is
(a) \( \frac{4 u}{238} \)
(b) \( -\frac{4 u}{234} \)
(c) \( \frac{4 u}{234} \)
(d) \( -\frac{4 \mathrm{u}}{238} \)
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