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← ScienceWhich outcome follows when critical mass is exceeded in uranium fission?
A)Chain reaction accelerates exponentially✓
B)Controlled fusion reaction initiates
C)Neutron moderation becomes more effective
D)Radioactive decay period immediately lengthens
💡 Explanation
The chain reaction accelerates because exceeding critical mass allows neutron population to grow geometrically via nuclear fission, therefore a runaway reaction occurs rather than controlled fusion. A moderator becoming more effective or the decay rate changing artificially are not possible.
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