Question

A U-238 nucleus originally at rest , decays by emitting an alpha- particle , say with a velocity of vm/s. The recoil (in m/s) of the residual nucleus is.?
Ans: 4v/238
bobpursley
work this out with conservation of momentum, the atomic mass of the alpha is 4amu
the mass of the recoiling nucleus is
... 238 - 4

r * 234 = v * 4

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