When a bismuth-208 nucleus at rest decays, thallium-204 is produced, along with an alpha particle (helium-4 nucleus). The mass numbers of bismuth 208, thallium-204, and helium-4 are 208, 204, and 4, respectively. (The mass number represents the total number of protons and neutrons in the nucleus.) The kinetic energy of the thallium nucleus is
a) equal to that of the alpha particle.
b) less than that of the alpha particle.
c) greater than that of the alpha particle.
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