For chain reaction to build up the size of the radioactive target should be______________?
Correct answer: A. Greater than the critical size
- A. Greater than the critical size
- B. Less than the critical size
- C. Equal to the critical size
- D. All of above can build up a change reaction
Explanation
A chain reaction builds up only when the radioactive material is supercritical, which requires a target size greater than the critical size so that each generation produces more neutrons than the previous one. The likely alternative is c, because critical size is the threshold for sustaining a reaction, but it does not make the reaction increase in intensity.
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About Radioactive Decay
Radioactive decay is the spontaneous transformation of unstable nuclei, described by decay constant, activity, half life and the exponential decay law. Work includes alpha, beta and gamma emissions, decay equations and remaining nuclei, with half life distinguished from the time required for complete decay.
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