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Which 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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