\( A^{238} U \) nucleus decays by emitting an alpha particle of speed \( v m s^{-1} \). The reco...

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\( A^{238} U \) nucleus decays by emitting an alpha particle of speed \( v m s^{-1} \). The recoil speed of the residual nucleus is (in \( m s^{-1} \) )
[CBSE PMT 1995; AIEEE 2003]
(a) \( -4 v / 234 \)
(b) \( v / 4 \)
(c) \( -4 v / 238 \)
(d) \( 4 v / 238 \)
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