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Nuclear fission splits a heavy nucleus when bombarded with:

AHigh-speed protons
BGamma photons
CAlpha particles
DLow-energy neutrons
Answer & Solution
Correct answer: D. Low-energy neutrons
1. Uranium, plutonium or thorium are used. 2. Low-energy neutrons trigger fission. 3. Tremendous energy is released. _Source: syllabus Science, Chapter 14, Sources of Energy._
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