Question

Which of the following best describes a chain reaction in a nuclear fission reaction? The chain reaction continues until the source of power that initiated the reaction is used up or is switched off. The chain reaction continues until control rods are used to stabilize the uranium-238 which controls the potential for explosions. The chain reaction continues until the rate of collision between uranium-235 and uranium-238 isotopes falls below useable levels. The chain reaction continues until all uranium-235 isotopes have split, or until the neutrons fail to collide with any more uranium