
Concept explainers
The reason for chain reaction dying out in small pieces of fissionable fuel, but not in large pieces.

Explanation of Solution
Introduction:
The chain reaction is the subsequent fission of the nuclei due to the neutron of the primary fission reaction. The amount of energy released in the chain reaction is very high.
The chain reaction occurs due to the fission of the nuclei. The heavy nuclei break into small nuclei to attain the stability of nuclei. The fission reaction takes place until all the nuclei reached to stable nuclei.
The large pieces are less stable compared to small pieces. So, the chain reaction dies out in small pieces of fissionable fuel.
Conclusion:
Thus, the chain reaction die out in small pieces of fissionable fuel but not in large pieces because the large pieces is less stable compared to small pieces of fissionable fuel.
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