A $^{238}U$ nucleus decays by emitting an $\alpha$ particle of speed $v\,m{s^{ - 1}}$. The recoil velocity of the residual nucleus is (in $m{s^{ - 1}}$)
- [AIEEE 2003]
- A$ - 4v/234$
- B$v/4$
- C$ - 4v/238$
- D$4v/238$
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