When a \[{{U}^{238}}\] nucleus originally at rest, decays by emitting – McqOptions

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1.	When a \[{{U}^{238}}\] nucleus originally at rest, decays by emitting an alpha particle having a speed the recoil speed of the residual nucleus is
A.	\[\frac{4u}{238}\]
B.	\[-\frac{5u}{234}\]
C.	\[\frac{4u}{234}\]
D.	\[-\frac{4u}{238}\]
Answer» D. \[-\frac{4u}{238}\]

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