Power Plant Engineering
In natural uranium, the constituents of three naturally occurring isotopes are

U₂₃₄ = 0.006%, U₂₃₅ = 99.282% and U₂₃₈ = 0.712%
U₂₃₄ = 99.282%, U₂₃₅ = 0.006% and U₂₃₈ = 0.712%
U₂₃₄ = 0.006%, U₂₃₅ = 0.712% and U₂₃₈ = 99.282%
U₂₃₄ = 0.712%, U₂₃₅ = 0.006% and U₂₃₈ = 99.282%

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Power Plant Engineering
Pick up the wrong statement

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

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