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31 July, 07:31

21. When does a nuclear fission reaction occur? A. When a nucleus is cut in two using a really sharp knife. B. When two nuclei collide and combine to one. C. When a large nucleus spontaneously is divided for no apparent reason. D. When the electric forces within the nucleus are stronger than the nuclear forces.

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  1. 31 July, 07:40
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    C

    Explanation:

    It's not A because you can't use a knife to cut an atom nucleus. Its size is not perceptible to the eye.

    It's not B because when two nuclei collide and combine into one, it's call fusion.

    It's not D because you can't have stronger forces than the ones holding the nucleus together.

    The correct answer is C.

    To fission, the nucleus needs to have at least two things: critical mass (only big ones can fission spontaneously) and instability (incorporate a neutron).
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