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Asked in GUJCET 2018 · Reactors and conditions for fission and fusion
Idea: the neutrons that come out at the instant of fission are called fast neutrons — they are born with a share of the ≈200 MeV released, not with thermal energy.
Their average kinetic energy is about 2 MeV.
That is exactly why a thermal reactor needs a moderator: these neutrons must be slowed to about 0.03 eV before ²³⁵₉₂U will capture them efficiently and keep the chain reaction going.
So the answer is about 2 MeV.
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