Nuclear fission basics: average neutrons from U-235 fission On average, how many fast neutrons are produced per fission of U-235 in a thermal reactor context? Choose the correct option.

Given data

• Nuclide: U-235 undergoing fission by thermal neutron absorption.

ConceptA single U-235 fission typically releases ~2–3 fast neutrons. Standard reference value ≈ 2.43–2.47; a commonly used nominal figure is 2.46.

CheckOrder of magnitude must be ~2–3, not tens or hundreds.

Final Answer2.46