Graphite was used as moderator to slow down neutrons. (1) What is the average lethargy change in graphite (C)? (2) The starting neutron energy is 2 neutron energy is 0.025 eV (Efn = on average for such moderation? MeV(E₁₁ = 2 MeV). The final thermal 0.025 eV). How many collisions needed

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