Question

uranium-235 undergoes fission to produce two neutrons per fission event. a neutron-absorbing material is mixed in with this sample. this causes the number of neutrons that can initiate fission events to decrease. which of the following will be effective at achieving a critical mass? check all that apply.
surround the sample with a deflective material to prevent neutrons from escaping to the surroundings.
add more absorbent material.
compress the uranium-235 sample.

Explanation:

Answer:

Surround the sample with a defective material to prevent neutrons from escaping to the surroundings.
Compress the uranium - 235 sample.