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  1. The secondary fuel used in nuclear power plants is

    2. A.

     U₂₃₃ and Pu₂₃₉
    B.

     U₂₃₅ and Th₂₃₂
    C.

     U₂₃₅ and Pu₂₃₈
    D.

     U₂₃₃ and Pu₂₃₈

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    Answer : Option A

    Explanation :


    The three most relevant fissile isotopes are Uranium-233, Uranium-235 and Plutonium-239.
    When the unstable nuclei of these atoms are hit by a slow-moving neutron, they split, creating two daughter nuclei and two or three more neutrons.
    These neutrons then go on to split more nuclei.
    This creates a self-sustaining chain reaction that is controlled in a nuclear reactor, or uncontrolled in a nuclear weapon.

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