When a \( \mathrm{U}^{238} \) nucleus originally at rest, decays by emitting an alpha particle h....

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When a \( \mathrm{U}^{238} \) nucleus originally at rest, decays by
\( \mathrm{P} \)
emitting an alpha particle having a speed ' \( u \) ', the
W
recoil speed of the residual nucleus is
(1) \( \frac{4 \mathrm{u}}{238} \)
(2) \( -\frac{4 \mathrm{u}}{234} \)
(3) \( \frac{4 \mathrm{u}}{234} \)
(4) \( -\frac{4 \mathrm{u}}{238} \)


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