What do we call changes that happen inside the nucleus of an atom?, Nuclear Reaction, Nuclear Fission, What type of reaction happens when a nucleus is hit by a particle?, Induced Reaction, Spontaneous decay, What do we call a reaction that happens naturally?, Spontaneous decay, Induced Reaction, What process splits a heavy atom into smaller atoms?, Nuclear Reaction, Nuclear Fission, Which system assumes both particles are moving?, Center of mass frame, Laboratory System.

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