15) Why is critical mass important for a fission chain reaction?
A. It keeps neutrons from escaping the sample.
B. It keeps neutrons from being absorbed by other isotopes.
C. It allows neutrons to be absorbed by other fissionable nuclei.
D. It provides enough fuel to make enough energy.
16) Why is a moderator important for a fission chain reaction?
A.It keeps neutrons from escaping the sample.
B.It keeps neutrons from being absorbed by other isotopes.
C. It allows neutrons to be absorbed by other fissionable nuclei.
D. It provides enough fuel to make enough energy.
17) Why is enrichment important for a fission chain reaction?
A. It keeps neutrons from escaping the sample.
B. It keeps neutrons from being absorbed by other isotopes.
C. It allows neutrons to be absorbed by other fissionable nuclei.
D. It provides enough fuel to make enough energy.