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Solve the given problem:

Problem: Suppose that a fission neutron, emitted with an energy of 2 Me V, slows down to an energy of 1 eV as the result of successive collisions in a moderator. If, on the average, the neutron gains in lethargy the amount in each collision,

Part A: How many collisions are required if the moderator is

(a) Hydrogen?

(b) Graphite?

I need the right answer and steps of solving this problem. Thank you!

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