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collisions required to reduce the neutron's energy

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Neutrons released by a fission reaction must be slowed by collisions with the moderator nuclei before the neutrons can cause further fissions. Suppose a 1.2-MeV neutron leaves each collision with 66% of its incident energy. How many collisions are required to reduce the neutron's energy to at least 0.040 eV, which is the energy of a thermal neutron?

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The solution finds the collisions required to reduce the neutron's energy, which are released by a fission reaction. The solution is detailed and well organized.

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