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A uranium nucleus (mass 238 u), initially at rest, undergoes a radioactive decay. After an alpha...

A uranium nucleus (mass 238 u), initially at rest, undergoes a radioactive
decay. After an alpha particle ( mass 4.0 u) is emitted, the remaining nucleus is
thorium (mass 234 u). If the alpha particle is moving at 0.050 times the speed of light, what is the recoil speed of the thorium nucleus?

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