In order for momentum to be conserved, the thorium nucleus and the helium nucleus must have ``equal and opposite" momenta. The relationship between momentum and total energy is . The kinetic energy is defined as . Therefore, the relationship between momentum and kinetic energy is or
The derivative of with respect to is which is always less than . Therefore, the helium nucleus will have more kinetic energy because it has smaller mass. Therefore, answer (E) is correct. |

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