Question

regulating fission nuclear reactions
neutron - absorbing material
rods containing uranium
nuclear reactor
a power plant needs to slow down the fission reactions in its nuclear reactor. in which direction should the uranium - containing rods in the diagram be moved? left up right down

Explanation:

Step1: Understand neutron - absorption

Neutron - absorbing material reduces neutrons available for fission.

Step2: Determine rod movement

Moving uranium - containing rods closer to neutron - absorbing material slows fission. In the diagram, moving them up will bring them closer to the neutron - absorbing material.

Answer:

up