Which of the following statements about chain reactions is true?

A. The key requirement for a chain reaction is that more neutrons are produced than that are absorbed.
B. Three or more neutrons must be released to sustain a chain reaction.
C. Only uranium isotopes are capable of supporting a chain reaction.
D. A chain reaction will only take place when a critical mass of material has been assembled.
E. It is not possible to stop or control a chain reaction once it has been started.


Answer: A

Environmental & Atmospheric Sciences

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