Power Plant Engineering
Pick up the wrong statement

Slow or thermal neutrons have energy of the order or 0.025 eV
Fast neutrons have energies above 1000 eV
Fast reactor uses moderator
In a heterogeneous or solid fuel reactor, the fuel is mixed in a regular pattern within moderator

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Power Plant Engineering
Natural uranium is made up of

99.282% U₂₃₈, 0.712% U₂₃₅, 0.006% U₂₃₄
99.282% U₂₃₄, 0.712% U₂₃₈, 0.006% U₂₃₅
99.282% U₂₃₅, 0.712% U₂₃₈, 0.06%' U₂₃₄
99.282% U₂₃₅, 0.712% U₂₃₄, 0.006% U₂₃₈

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