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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