Question: When 𝑈 238nucleus originally at rest, decays by emitting an alpha particle having a speed u The recoil speed of the residual nucleus is
(A) \dfrac{4u}{238}
(B) -\dfrac{4u}{234}
(C) \dfrac{4u}{234}
(D) -\dfrac{4u}{238}
Answer: Option (C)
Solution:
