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A parent nucleus that is initially at rest undergoes alpha decay to become a new daughter nucleus. The daughter nucleus has an approximate mass of 100 u, and the alpha particle is emitted with kinetic energy of 2.5 MeV.

Which one of the following is closest to the recoil energy of the nucleus?

A

0.1 MeV

B

10 MeV

C

40 MeV

D

250 MeV

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